BOXES, COIN COLLECTING
(PREPAYMENT)

POEEJ article on the Jubilee interior and equipment

Taken from
Technical Instruction XXXVI Part 4 (Dated 1932)

"Box C.C., No. 14, Complete"

96. "Box C.C., No. 14, Complete," "Box C.C., No. 14A, Complete," and "Box C.C., No. 14B, Complete" described in detail in the succeeding paragraphs supersede "Box C.C., No. 13, Complete," and "Box C.C., No. 13, with Box Cash No. 7." Devices for the prevention of fraud which were not included in "Box C.C., No. 13" are incorporated in them and they do not, like "Box C.C., No. 13, Complete," form part of a telephone, viz., Telephone Nos. 115, 115A, 123 or 123A, but are independent self contained units.

97. "Box C.C., No. 14, Complete," is suitable for fixing on a wall for use on a public Call Office circuit in conjunction with Telephone No. 131 in Automatic and Rural Automatic areas and in conjunction with Telephone No. 131 C.B. in Manual (C.B.) areas.

98. "Box C.C., No. 14A, Complete" is suitable for fixing on a wall or on a table or shelf for use on a subscriber's line in conjunction with Telephone No. 131 or Telephone No. 182 in Automatic and Rural Automatic areas and in conjunction with Telephone No. 131 C.B. or Telephone No. 182 C.B. in Manual (C.B.) areas according to the type of telephone required in each case.

99. "Box C.C., No. 14B, Complete" is suitable for fixing under conditions equivalent to those which are applicable to "Box C.C., No. 14, Complete" see paragraph 97, and has been introduced to enable Telephone No. 115A and Telephone No. 123A, each of which include "Box C.C., No. 13, with Box Cash No. 7," to be made obsolete. It is used in the same circumstances as the telephones have been used hitherto, see paragraph 25. The containing case, "Box Cash No. 11", differs from that of "Box C.C., No. 14, Complete," (i.e., Box Cash No. 8) inasmuch as it has a returned coin trough extending the whole width of the case surmounted by a plate glass front approximately 4.5" in depth. This difference provides an additional safeguard against fraud as explained in paragraph 103.

100. Illustrations
The external appearance of the three boxes is illustrated further down this page.

101. Box C.C., No. 14, Complete, and Box C.C., No. 14B, Complete, Rate Book Descriptions
The above complete coin-collecting boxes comprise:-

1. 1 Box Cash No. 8 (the containing case). 1 Box Coin-Collecting No. 14 (the mechanism)
   and the two items are known as Box C.C., No. 14, Complete.

2. 1 Box Cash No. 11 (the containing case). 1 Box Coin-Collecting No. 14 (the mechanism)
   and the two items together are known as Box C.C., No. 14B, Complete.

102. The Rate Book description of the items required for the equipment of Public Call Office circuits are as follows:-
In Manual (C.B.) exchange areas.
1 Box C.C., No. 14, Complete, or 1 Box C.C., No. 14B, Complete.
1 Telephone No. 131 C.B.
1 Relays and Coils No. 29AO.
1 Label No. 43A.

In Automatic exchange areas.
1 Box C.C., No. 14, Complete, or 1 Box C.C., No. 14B, Complete.
1 Telephone No. 131.
1 Dial Automatic No. 11.
1 Label No. 43A.

In Rural Automatic 50/200 line (Advance Supply, see paragraph 164)
exchange areas.
1 Box C.C., No. 14, Complete, or 1 Box C.C., No. 14B, Complete.
1 Telephone No. 131.
1 Dial Automatic No. 11.

In Rural Automatic 25/100 line (see paragraph 163) exchange areas.
1 Box C.C., No. 14, Complete, or 1 Box C.C., No. 14B, Complete.
1 Telephone No. 131.
1 Dial Automatic No. 11.
1 Relay No. 281AN.

103. "Box C.C., No. 14, Complete," will be fitted in normal circumstances and "Box C.C., No. 14B, Complete," when specified on the Advice Note by the Controller, London Telephone Service or District Manager. The latter box is installed in localities where fraud is found to be prevalent through criminally inclined persons plugging up the returned coin chute with paper, for the purpose of preventing Callers from obtaining the return of coins after making an ineffective call, see paragraphs 104 (b) and 110, thus enabling money to be dishonestly collected from the trough on the removal of the paper subsequently.

104. The chief features of each coin-collecting box are:-

1. Except in connexion with emergency calls, made from certain Kiosks in C.B. areas see paragraph 129 et seq the local fee must be inserted before the exchange can be called in the case of the C.B. exchange, while in an Automatic or Rural Automatic Area the insertion of the local fee is necessary before any number except a special digit or a pair of special digits can be dialled.

2. Two press buttons A and B are provided to control the disposition and return of coins inserted, see paragraphs 108 to 110.

3. Facilities are provided for such additional fees as may be required for Toll and Trunk calls, or for the transmission of telegrams to be collected thus permitting other than local fee calls to be dealt with at Call Offices.

4. Pennies, sixpences and shillings are accepted.

105. General Description
A description of the operation of the coin-collecting boxes and the associated apparatus is given below together with instructions for installation.

106. Coin Slots
Three coin slots marked "Penny," "Sixpence," and "Shilling" respectively are provided on the top of the box. The size of each slot is such as to prevent the use of coins of a larger size than that of the denomination shown or of badly bent or misshapen coins. If a smaller coin than that indicated is inserted in any of the slots it is thrown out by means of a coin gauge, falls into the refund trough and is thus returned to the Caller.

107. Gong Signals
In C.B. areas, all calls must be passed via the exchange operator and to gain attention it is necessary, except in the case of emergency calls from certain Kiosks see paragraph 129 et seq, to insert as a minimum the amount of the fee for a local call. In Automatic and Rural Automatic areas all calls except local fee calls must be passed via the manual switchboard of the automatic exchange where the attention of the operator is gained by dialling a special digit or a pair of special digits without the precedent insertion of a fee. In the first case (C.B. areas) coins which may have to be inserted in addition to the local call fee and in the second case (Automatic and Rural Automatic areas) the whole of the coins inserted to cover the call made can be checked by gong signals as follows:-
Each penny inserted strikes a wire gong once, giving a deep toned sound, each sixpence strikes a bell gong once, giving a high pitched sound, and each shilling strikes the bell gong twice. The two gongs therefore give distinctly different sounding signals, which actuate the small Transmitter No. 21 provided in the coin-collecting box, making them audible to the operator and thus enabling the value of the coins inserted in the box to be checked.

108. Buttons controlling the deposit and return of coins
After insertion, the coins are held in suspension in a pivoted container which is controlled mechanically by two press buttons marked "A" and "B."

109. The depression of button "A" situated in the front of the box, causes all coins the Caller has inserted to be deposited in the cash box and when so deposited the coins cannot be returned. When connexion with the required number is obtained, button "A" must be depressed momentarily before conversation can be carried on.

110. The depression of button "B," which is fitted at the right-hand side of the box, causes any coins held in suspension in the container referred to previously to be refunded to the Caller. The coins so returned fall into a trough in front of the C.C. box. Button "B" is used when the number called is unobtainable and for the recovery of any coins inserted in the box in the event of a fault existing which prevents the exchange from being called.

111. Capacity of Coin Container
The container in which the coins are held in suspension is divided into three sections, the respective capacities of which are:-
10 Pennies
8 Sixpences.
10 Shillings.

112. Construction of Box Cash No. 8 (the containing case)
The box which is constructed of compressed steel is divided into two compartments. The upper compartment accommodates the mechanism, i.e. Box C.C., No. 14, and the lower one, which is closed by a removable bottom plate, forms a cash box. Independent access to the two compartments is provided. Access to the mechanism in the upper compartment is obtained by removing a detachable front which, when in position, is secured by a lock. Keys, Lock J, for use therewith should be requisitioned separately and held by the Engineering Staff for maintenance purposes.

113. Construction of Box Cash No. 11 (the containing case)
The construction of this box, the mechanism, and wiring arrangements, are identical with those of Box Cash No. 8 as detailed in paragraph 112, the only difference between the two boxes being in respect of the special return coin chute and glass front provided in connexion with the Box Cash No. 11, see paragraph 99.

114. Box C.C., No. 14 (Mechanism No. 14)
The whole of the mechanism is hinged in such a way that it can be swung clear of the box for inspection or adjustment, or entirely withdrawn, if necessary, for repair or replacement.  To remove, firstly locate the lever attached to the cash shute, under the mechanism and lift the lever up.  The left hand side of the mechanism can then be swung outwards. Once the mechanism is open enough as to not foul the top of the case, then lift the mechanism upwards until the two hinges are free from their fixings on the case.

115. The electrical connexions between the hinged mechanism and the connexion strip on which the wiring entering the box is terminated are made by means of a plug and jack. The jack and connexion strip are carried on one mounting plate and the combination can be readily removed from the cash box for maintenance purposes, if required, when the wires on the connecting strip have been disconnected.

116. The mechanical features of Box C.C., No. 14, Complete, and Box C.C., No. 14B, Complete, are exactly the same for Manual (C.B.) and Automatic working and the mechanism in either of the boxes used on one system is interchangeable with one used on the other system without alteration.

117. Cash Box and Locks
Access to the cash portion of Box C.C., No. 14, Complete, and Box C.C., No. 14B, Complete, for the purpose of collecting deposited cash is obtained by removing the bottom plate which is secured in position by means of a lock. For information relative to the locks and keys to be used and the conditions attending their use, see paragraphs 214 to 230.

118. Apparatus Lay-out
The general arrangement of the apparatus and notices in telephone cabinets and Kiosks Nos. 1, 2, 3 and 4 should be strictly in accordance with the lay-out plans relative to Manual (C.B.), Automatic, and Rural Automatic areas, and the conditions, specified in Technical Instructions XXXVI, Part 1.

119. Wiring
Cable E and C.C. n/10 should be used for all wiring between the telephone and the associated apparatus, as indicated by diagrams C.B. 1422 (N1170) A.T. 2203 (N1175) and A.T. 2206 (N1180) and all wiring should be run on the rear of the wallboard, full use being made of the holes for leading in wires provided on the back of the apparatus.

120. Fixing
The telephone and coin-collecting box should be fixed to the wallboard by means of the screws and bolts and nuts issued with the apparatus.

121. Lighting
Good lighting is essential in Call Offices fitted with prepayment coin-collecting boxes and any steps practicable should be taken to obtain satisfactory conditions in this respect. Details of standard lighting arrangements in cabinets and the various kiosks and instructions regarding the maintenance of fittings are given in Circular Power 469 Monthly List, June 1930, which will be issued shortly as Loose Leaf Series Technical Instructions, Telephones, Call Offices, D 3001, Telephone Kiosks and Cabinet Lighting.

122. Tests
The schedule of tests to prove the correct operation of the coin-collecting box mechanism on Manual (C.B.), Automatic and Rural Automatic systems is given in diagrams N1173, N1178, and N1183, respectively.

123. With the exception of the test of gong and chutes for silver coins all necessary tests can be made by means of the present (penny) tokens. The occasion on which tests of the sixpenny and shilling chutes and gong are necessary are expected to be very few and tokens equivalent to those coins are therefore not supplied. When such tests are necessary, however, it is anticipated that Maintenance Officers will have suitable coins available and by swinging the mechanism forward when making the tests, any risk of coins being deposited in the cash box can be avoided.

124. Maintenance
Minor repairs, such as the adjustment of spring contacts, escapement, pendulum, balance, counter weight and the clearance of obstructions from the chute can be carried out readily with the mechanism in situ.

125. The escapement should be adjusted by means of the pendulum bob so that Springs Nos. 11 and 12 remain closed and springs Nos. 13 and 14, see Figure 9 (Spring Assembly No. 3), remain open for a period of about seven seconds when the "B" button is depressed.

126. The operation of the balance-arm is controlled by means of a counter weight and the adjustment should be such that the arm is just actuated by the weight of two well-worn pennies.

127. Where repairs of a more extensive character are necessary the mechanism should be replaced under Maintenance Exchange.

128. Fault Records
In order that uniformity of practice in the recording of faults may prevail, the descriptions of the various parts of the mechanism given on Figure 9 and on diagram E.C. 1415 (N1185), should be used. The entry on a fault card showing the nature and cause of the fault should clearly indicate the part of the coin-collecting box on which the defect occurred.

129. Emergency Call Arrangements in Kiosks accessible from the Public Highway in Manual (C.B.) Areas
In order that the exchange may be called in respect of emergency calls, e.g., Fire, Police and Ambulance, without the insertion of the usual fee when a prepayment type of coin-collecting box is fitted in a kiosk accessible from the public highway, on a Call Office circuit connected to a Manual (C.B.) exchange, the following arrangements should be made.

130. A Press Button G, Brass, with water-tight barrel associated with an earth-connected 50-ohms resistance bobbin should be fitted in the kiosk and joined up in such a way that the earthed resistance is normally disconnected but is connected directly to the "B" line when the button is depressed.

131. Resistance bobbins of the values specified on the relevant diagram, see paragraph 146, should also be provided, and inserted in the circuit in the position indicated, for the purpose of preventing the operation of a marginal relay at the exchange when a normal call is made. They should be located as indicated by the relevant diagram.

132. The press button should be fitted immediately above the Telephone No. 131 C.B. and a Label No. 161 should be fitted behind the fixing plate. A Label No. 37, White, engraved EMERGENCY CALL (Engraving SB, Filling Red) should also be fitted immediately above the press button.

133. Frame, Notice, No. 18 for the accommodation of an Emergency Notice T. 403G, should be fitted immediately above the emergency call label as shown on the relative standard apparatus and notice lay-out plans specified in Technical Instructions XXXVI, Part 1.

134. The exchange name and telephone number, only, should be displayed on a Card S.S. 506 placed in the Frame, Notice, No. 1 on the Telephone No. 131 C.B. and the telephone transmitter should be fitted with a Label No. 43A.

135. Cards S.S. 506 and T. 403G should be obtained and fitted as laid down in Technical Instructions XXXVI, Part 1.

136. Modifications to Manual (C.B.) Exchange Equipment
Certain modifications, are necessary at Manual (C.B.) exchanges when prepayment coin-collecting boxes are installed whether, or not, emergency call facilities are provided as in the case of kiosks accessible from the public highway, see paragraphs 129 to 135 and paragraphs 137 to 139. The circuit arrangements required at a Manual (C.B.) exchange for working in connexion with circuits having prepayment coin-collecting boxes associated with them are shown by diagram C.B. 1241, Figures 1-4.

137. When provision is made for emergency Fire, Police and Ambulance calls from a Kiosk accessible from the public highway, see paragraphs 129 to 135, the circuit concerned should be joined up at the exchange in accordance with diagram C.B. 1241 (Figures 1 and 1A), the necessary equipment being provided and arranged as laid down in the mimeographed circulars of June 4th, 1929 and August 9th, 1929, entitled "Prepayment Type Coin-collecting Boxes, Emergency Call Facilities."

138. When the modifications indicated by diagram C.B. 1241 have been carried out, the conditions at a C.B. exchange on the lines concerned are as outlined in paragraphs 139 to 145.

139. Calling Equipment.

1. Normal case, i.e., when emergency call facilities are not provided - The "A" line is disconnected from the cut-off relay (C.B. 1241, Figure 1).

2. When emergency call facilities are provided - All the leads to the normal calling equipment are disconnected throughout and are connected instead to a special calling equipment, the "A" line being left disconnected (C.B. 1241, Figures 1 and 1A).

140. "A" position cord circuits, with Condensers and Impedance Coils, diagram (C.B. 1241, Figures 3 and 4)
The resistance spool normally fitted in the sleeve circuit of the calling cord is replaced by a relay thus providing for the required reversal of the exchange battery on the answering cord when the calling plug is inserted into a jack.

141. "A" position cord circuits with repeating coils (C.B. 1241, Figure 2)
The 83-ohm resistance spool normally fitted in the sleeve circuit on the calling plug side is replaced by a Relay HO, shunted by a 400-ohm resistance spool, and Relays HR and HA are fitted in train with Relay HO. The connexions of the Relay HR provide for the reversal of the exchange battery on the answering side of the cord circuit when the calling plug is inserted into a jack, and the method of connecting the operator's telephone circuit to the contacts of Relays HA and HO ensures that that circuit is temporarily disconnected during the momentary period of battery reversal, thus minimising the click received by the operator when the battery reversal takes place.

142. To distinguish the modified cord circuits from the ordinary cord circuits, the speaking and listening keys of the former are provided with cerise coloured plug covers and key handles.

143. The modified cord circuits can be used for answering ordinary subscribers' circuits but not for answering on jack-ended junction circuits.

144. For the completion of reverted calls (e.g., trunk calls, etc.), transfer lines wired in accordance with diagram C.B. 1415, are required. Duplicate jacks are necessary because the cord circuit answering plug must always be used in the Call Office line. The extra jack permits of the plug in the transfer circuit being changed without "clearing" at the distant end.

145. Hold Jacks
See paragraph 158. These are provided on the "A" positions as indicated by diagram C.B. 1241, Fig. 5.

146. Operation of circuit in a Manual (C.B. exchange area)
The diagrams referring are:-
Call Office circuit - Box, Coin-Collecting, No. 14, Complete, or Box, Coin-Collecting, No. 14A, complete, with Telephone No. 131 C.B. - Wiring diagram for C.B. system - C.B. 1422 (N1170).

Box, Coin-Collecting, No. 14, Complete, with Telephone No. 131 C.B. and Box, Coin-Collecting, No. 14A, Complete with Telephone No. 131
C.B or No. 182 C.B. - Explanatory diagram for Manual (C.B.) system - C.B. 1424 (N1172).

Wiring diagram of Relays and Coils No. 29AO - C.B. 1428 (N1187).

C.B. Nos. 1, 10 and 10A Call Office circuits for prepayment exchanges. coin boxes. (Exchange end-line and cord circuits) - Explanatory - C.B. 1241

Telephone No. 131 C.B. - C.B. 1429 (N231 panel 1).

147. Normal Conditions
These are shown by Diagram C.B. 1424 (N.1172). The coin-collecting box transmitter (Transmitter No. 21) and the polarized relay (Relay No. 19A) are short circuited via the closed contacts 6-7 of spring assembly No. 1, the induction coil 26 ohm winding is connected via the closed contacts 2-3 of spring assembly No. 1 to one side of the condenser that is common to the bell and speaking circuits and the "A" and "B" lines are bridged by the bell in series with the common condenser via the closed contacts 13-14 of spring assembly No. 3 while the contacts 8-9 of spring assembly No. 2 are open. The telephone is therefore available for incoming calls.

148. Calling the exchange for a normal call
The removal of the receiver from the gravity switch operates the usual gravity switch connexions and loops the A and B lines but, as the normal Earth connexion to the "A" line at the exchange is disconnected at the cut-off relay, the line relay is not operated by the telephone loop, see diagram C.B. 1241, Figure 1.

149. The first penny inserted actuates a crank arm situated immediately below the coin slots thereby operating the coin-collecting box spring assembly No. 1, see Diagram C.B. 1424 (N1172), opening contacts 6-7 and 2-3 and closing contacts 4-5 and 1-2. The opening of contacts 6-7 removes the short circuit from the coin-collecting box transmitter and polarized relay whilst the closing of contacts 4-5 prepares a circuit which, when completed by the operation of the polarized relay, short circuits the telephone transmitter (Transmitter No. 1). The polarized relay does not, however, operate until after the attention of the exchange operator is obtained and the call has been extended, see paragraph 153. The opening of contacts 2-3 and the closing of contacts 1-2 transfers one end of the induction coil 26 ohm winding from the normal point of connexion to one side of the condenser, that is common to the bell and secondary speaking circuits, to the centre point of the bell, thus preventing a Caller from using the receiver as a transmitter, a species of fraud which, if not prevented, would enable the Caller to avoid the use of Button A, see paragraph 154, and ultimately to recover his fee by pressing Button B, see paragraph 156 on the completion of a call. The penny after rolling down an inclined chute drops into a container where it comes to rest on a pivoted balance arm.

150. On the insertion of a second penny, which rolls down the chute and comes to rest in a similar manner to the first, the combined weight of the two pennies depresses the balance arm thus actuating the coin-collecting box spring assembly No. 2, see diagram C.B. 1424 (N1172), closing contacts 8-9 thereby earthing the "B' line and causing the operation of the exchange calling signal. The circuit of the line relay at the exchange is completed via Earth, contacts 8-9, one winding of the retardation coil, gravity switch contact, primary winding of induction coil, contacts 13-14 of the coin-collecting box spring assembly No. 3, see diagram C.B. 1424 (N1172), "B" line, cut-off relay and battery to Earth, see diagram C.B. 1241, Figure 1.

151. Exchange answers
When the operator inserts the answering plug, the cut-off relay is operated and battery is connected to the "B" line and Earth to the "A" line via the cord circuit. The polarized relay, shown on diagram C.B. 1424 (N1172) is now in circuit but, as it is arranged to operate only with a negative battery connexion on the "A" line, it does not operate at this stage. Consequently the telephone transmitter (No. 1) is in circuit for speech and the Caller is able to speak to the exchange operator. The coin-collecting box transmitter No. 21 is also in circuit in series with the line.

152. If it is found when the operator takes particulars of the number required that the operating procedure does not permit of the immediate extension of the circuit and that the insertion of additional coins is necessary, the cord circuit calling plug is inserted in the "Hold" Jack described later, see paragraphs 158 and 159, until the call matures and the value of the additional coins inserted has been checked by the gong signals rendered audible via the coin-collecting box transmitter, after which the calling plug is transferred to the jack of the wanted line.

153. Caller connected
The insertion of the calling plug into a subscriber's or junction jack (or "Hold" jack if additional coins are necessary) reverses the tip and ring connexions of the answering cord so that battery is now connected to the "A" and Earth to the "B" line. The polarized relay is therefore operated and the telephone transmitter is short circuited, consequently, although the Caller is able to recognize that the correct connexion has been made he cannot speak to his correspondent until he has depressed Button A.

154. When the Caller hears his wanted correspondent he must press Button A momentarily thus operating the Button A lever the movement of which releases the balance arm, causes the coins to be deposited and the coin-collecting box spring assemblies 1 and 2 to be restored to normal. The short circuit is therefore removed from the telephone transmitter, the polarized relay and the coin-collecting box transmitter are again short circuited, the normal connexion of the induction coil 26 ohm winding is restored and the Earth which was applied for exchange calling purposes is removed from the "B" line. The removal of the Earth results from the opening of springs 8-9 of spring assembly No. 2 while the other operations previously mentioned result from the movement of the spring assembly No. 1.

155. The call can now proceed in the normal manner and standard conditions exist for supervisory and clearing signals.

156. Ineffective Calls
If the call is ineffective, the Caller obtains the return of his coins by pressing the "Refund" button B. The depression of Button B operates the escapement mechanism restoring spring assemblies 1 and 2 permanently and actuating spring assembly No. 3 for seven seconds. On the restoration of spring assembly No. 1, the conditions of the speaking circuit revert to normal, see paragraph 147, and the restoration of spring assembly No. 2 removes the Earth which was connected to the "B" line, via contacts 8-9. The actuation of spring assembly No. 3 disconnects the "B" line at contacts 13-14 and by the closing of contacts 11-12 Earth is connected to the 2,000 ohm relay (Relay 138B) which is then operated by a current from the exchange via the "A" line. The relay therefore locks up via its "make" contact and the "A" line is disconnected from the speaking circuit at the "break" contact. The disconnexion of the "A" line results in a clearing signal being given which persists until the Operator at the exchange takes down the connexion.

157. Misuse of "Refund" button and use of "Hold" jack
Should a Caller depress the "Refund" button B after the Operator has answered but before the calling plug is inserted into a jack the operation of the escapement mechanism, results in the actuation of spring assembly No. 3 for seven seconds dining which time the "B" line is disconnected at contacts 13-14 and, consequently, a clearing signal which persists for the seven seconds is given at the exchange. Incidentally springs 11-12 of Spring Assembly No. 1 are closed, applying Earth to the 2,000 ohm relay (Relay No. 138B) but this relay remains un-operated because no suitable battery connexion to the "A" line exists at the exchange. Incidentally also spring assemblies 1 and 2 are restored to normal in consequence of which the polarized relay is short circuited, the induction coil connexion is restored to normal and the Earth previously connected to the "B" line is removed. None of these latter incidental changes, however, have any deterrent effect and the prevention of the fraud rests on the previously referred to seven seconds clearing-signal which should be observed and challenged by the operator. If, however, the operator fails to observe the clearing signal and the calling plug is inserted in a subscriber's or junction jack within the seven seconds period the battery connexions to the "A" and "B" line will be reversed and the 2,000 ohm relay will operate, lock up, and permanently disconnect the line.

158. Hold Jack
As a further precautionary measure a "Hold" jack is provided on each "A" position dealing with prepayment coin-collecting box circuits for use in operating any calls when, on account of operating procedure, it is impossible or undesirable to connect the calling plug immediately to a subscriber's or junction jack. The same conditions, as when the calling plug is inserted in an ordinary jack, are set up when the plug is inserted in a "Hold" jack. Any attempt on the part of a Caller to obtain a call without payment by securing the refundment of his money, i.e. by pressing Button B during the interval before the required connexion is completed therefore results in a clearing signal being given at the exchange as described in paragraph 156 dealing with ineffective calls.

159. The "Hold" jack is used also while the insertion in the coin-collecting box of any additional fees required is being checked by the operator, see paragraph 152.

160. Calling the exchange for a Service call or for an Emergency (Fire, Police and Ambulance) call from a Call Office where an emergency press button is not fitted
To call the exchange the local fee as for a normal call must be inserted in the coin-collecting box. The operation of the apparatus is then as described in paragraphs 148 to 151. Having answered the call and taken particulars of the number required the operator instructs the Caller to press Button B in order that the repayment of the fee inserted at the outset may be obtained. The effect of pressing Button B at this stage is to restore coin-collecting box spring assemblies Nos. 1 and 2 with the result that the coin-collecting box transmitter and polarized relay are again short circuited, the normal connexions of the speaking circuit are reverted to and the Earth applied to the B line for exchange calling purposes is removed, so that, when the calling plug is inserted into the jack of the wanted line by the exchange operator and the battery reversal takes place, the polarized relay remains un-operated and the conversation can proceed in the normal manner. The conditions that provide for the receipt of a clearing signal on the termination of the call are not affected by the change of procedure.

161. Calling the exchange for an Emergency (Fire, Police and Ambulance) call from a Call Office where an emergency press button is fitted, e.g., in a Kiosk accessible from the public highway in a Manual (C.B.) area. On the depression of the emergency button, a low resistance Earth (50 ohms) is connected directly to the "B" line causing the operation of the emergency relay E and the line relay L at the exchange, see diagram C.B. 1241, Figure 1A. On operation the relays lock and an interrupted earth is connected to the calling lamp, causing it to flash until the answering plug is inserted. By calling the exchange in the foregoing manner the operation of the Call Office apparatus which takes place in the case of a normal call is obviated and the call when extended can proceed as in the case of a call from an ordinary subscriber's instrument, including the transmission of a clearing signal at the termination of the call in the usual way.

162. Automatic Exchanges (excluding Rural Automatic Exchanges)
No special arrangements are necessary. The provision and segregation of switches and "0" level circuits will be carried out in accordance with the equipment specification.

163. Rural Automatic 25/100 line Exchanges, using Units Automatic No. 5 referred to hereafter simply as Rural Automatic 25/100 line exchanges. Some modification of the normal arrangements for ordinary subscribers' lines is necessary. Details of the requirements are given in Technical Instructions XXV Part 14B.

164. Rural Automatic 50/200 Line Exchanges, using 50/200 line Units (Advance Supply) referred to hereafter simply as Rural Automatic 50/200 Line (Advance Supply) Exchanges. Some modification of the normal arrangements for ordinary subscribers' lines is necessary. Details of the requirements are given in Technical Instructions XXV, Part 14C.

165. Operation of circuit in an Automatic or Rural Automatic Exchange area
The diagrams referring are:-
Call Office Circuit - Box, Coin-Collecting, No. 14, Complete, or Box, Coin-Collecting, No. 14A, Complete, with Telephone No. 131 - Wiring diagram for Automatic system - A.T. 2203 (N1175).

Call Office Circuit - Box, Coin-Collecting, No. 14, Complete, with Telephone No. 131 and Box Coin-Collecting, No. 14A, Complete, with Telephone No. 131 or No. 182 - Explanatory diagram for Automatic system - A.T. 2205 (N1177).

Call Office Circuit - Box, Coin-Collecting, No. 14, Complete, or Box, Coin-Collecting, No. 14A, Complete, with Telephone No. 131 - Wiring diagram for Rural Automatic system - A.T. 2206 (N1180).

Call Office Circuit - Box, Coin-Collecting, No. 14, Complete, with Telephone No. 131 and Box, Coin-Collecting, No. 14A, Complete, with Telephone No. 131 or No. 182 - Explanatory diagram for Rural Automatic system - A.T. 2210 (N1182).

Telephone No. 131 - A.T. 2209 (N231 panel 2).

166. Although there is a reference to Box, Coin-Collecting, No. 14A, Complete, but not to Box, Coin-Collecting, No. 14B, Complete, in the titles of the diagrams specified in the preceding paragraph it should be understood that the diagrams apply equally to installations which include a Box, Coin-Collecting, No. 14B, Complete, also, notwithstanding the reference thereto, that Box, Collecting, No. 14A, Complete and Telephone No. 182 are not used on public Call Office circuits but only on ordinary subscribers' circuits. In addition it should be understood also that diagrams A.T. 2203 (N1175) and A.T. 2205 (N1177) refer to Rural Automatic 50/200 line (Advance Supply) exchanges as well as to ordinary automatic exchanges and that diagrams A.T. 2206 (N1180) and A.T. 2210 (N1182) refer only to Rural Automatic 25/100 line exchanges.

167. Type of Dial
The Dial, Automatic No. 11 (which should be requisitioned separately and fitted on the telephone with which a prepayment coin-collecting box line is equipped) is a modification of the Dial, Auto. No. 10. The modification to Dial Auto. No. 10 consists of the addition of an auxiliary impulse control cam and a pair of spring contacts the latter of which are recognisable by the numbering 15 and 16 on diagrams A.T. 2205 (N1177) and A.T. 2210 (N1182). The modification is made for the purpose of enabling Callers to obtain the attention of the exchange, without previously inserting any coins in the coin-collecting box, on dialling a single special digit when the Call Office is situate in an ordinary Automatic or Rural Automatic 50/200 (Advance Supply) Exchange area or a pair of special digits when the Call Office is in a Rural Automatic 25/100 Line Exchange area. The auxiliary impulse control cam is mounted loosely on the main spindle of the dial and is actuated by the dial switching-lever when the special digit or the first of a pair of special digits is dialled, its function being to open the dial spring contacts 15-16 thus removing, in a special manner, the short circuit across the dial impulse springs which is normally removed, as described in paragraph 174, by the operation of coin-collecting box spring assembly No. 2 when coins are inserted.

168. In ordinary automatic exchange areas the special digit used is 0. In Rural Automatic 25/100 Line Exchange areas where the use of a pair of special digits is necessary the first of the pair is also 0 while the second may be any number from 1 to 9 inclusive according to the junction arrangements at the particular exchange concerned. In both these classes of exchange area the dial to be fitted is a standard Dial, Auto. No. 11 having a standard auxiliary impulse control cam carrying only one stud, suitably placed for the actuation of the cam when 0 is dialled. With the stud in the position indicated dial springs 15 and 16 open when the auxiliary impulse control cam is actuated and they do not close again until 10 impulses have been transmitted and the auxiliary impulse control cam has been returned to its normal position. This suffices in the case of the ordinary automatic exchange area but in a Rural Automatic 25/100 Line Exchange area the restoration of the short circuit by the closing of dial springs 15 and 16 is nullified as explained in paragraph 178 by the action of an associated relay until a second special digit has been dialled.

169. In a Rural Automatic 50/200 Line (Advance Supply) Exchange area it is necessary to change the standard auxiliary impulse control cam for a special one in which ten tapped holes are provided round its periphery in positions corresponding to those of the digits round the dial number ring and on which two studs are provided. These studs are inserted, when necessary, in two of the holes to meet the requirements of the junction arrangements at the particular exchange concerned as provided for in Technical Instructions XXV, Part 14 C, paragraphs 90, 91 and 92. Two studs are not always required, however, e.g., when the rural automatic exchange is associated only with the parent exchange and there is, therefore, only one group of junctions available as an outlet, but two studs are necessary when there are junction groups connecting the rural automatic exchange to one or more exchanges in addition to the parent exchange. In the first case the single stud required is fitted in the hole in the cam where it will be operative when the digit 0 is dialled and the second stud is placed in an inoperative position on the opposite side or face of the cam. In the second case one stud is placed in the hole in the cam in which it will provide for the operation of the auxiliary impulse control earn when the lowest junction group digit is dialled and the other is placed in the "0" position. The former digit may be 7, 8 or 9 according to the switch levels on which the junction groups are accommodated at the exchange. When only one stud is used the short circuit across the dial impulse springs is removed and restored by the action of the cam when 0 is dialled in virtue of the position occupied by the stud. When, however, two studs are used the short circuit across the dial impulse springs is removed when 7, 8 or 9, as the case may be, is dialled in virtue of the position occupied by one of the studs and restored when the dial returns to normal in consequence of the other stud occupying the "0" position on the cam. The two types of auxiliary impulse control cam are illustrated by Figure 10.

Fig. 10. - Auxiliary Impulse Control Cams as used with Dial, Automatic No. 11.

170. Normal Conditions
These are shown by diagrams A.T. 2205 (N1177) and A.T. 2210 (N1182). The former diagram refers to the ordinary Automatic and Rural Automatic 50/200 (Advance Supply) exchange systems and the latter diagram to the Rural Automatic 25/100 line exchange system. The diagrams show in one case that the dial contacts 15-16 and the coin-collecting box spring assembly No. 1 contacts 9-10 are directly in series while in the other ease the two pairs of springs are also in series but with the contacts and coil of a 75-ohm relay, in series, interposed between them. In both eases therefore a short circuit exists across the dial impulse springs. In other respects the circuit arrangements shown by the two diagrams are identical, the coin-collecting box transmitter (No. 21) being short circuited via the coin -collecting box spring assembly No. 1, contacts 6-7, the induction coil 26-ohm winding being connected via spring assembly No. 1, contacts 2-3, to one side of the condenser that is common to the bell and speaking circuits, and the A and B lines being bridged by a bell in series with the common condenser via the coin-collecting box spring assembly No. 3, contacts 13-14. Therefore, under the foregoing conditions, the telephone is available for calls incoming from the exchange.

171. As previously stated, see paragraph 116, the mechanical features of Box C.C., Nos. 14, Complete, and 14B, Complete, are exactly the same whether used for Manual (C.B.) or automatic working, and the mechanism, Box corn-collecting No. 14, used on one system is interchangeable with one used on the other system without alteration. No special relays or coils are required at the Call Office to meet Automatic and Rural Automatic 50/200 line (Advance Supply) exchange conditions but to meet the conditions at Rural Automatic 25/100 line exchanges it is necessary to provide and fit a Relay No. 281AN at the Call Office and to connect it as shown by diagrams A.T. 2206 (N1180) and A.T. 2210 (N1182).

172. Calling the Exchange
The removal of the receiver from the gravity switch operates the usual gravity switch connexions, looping the "A" and "B" lines in preparation for the transmission of impulses when the dial is operated.

173. Unit Fee Call to an Automatic exchange, a Rural Automatic 25/100 line exchange or a Rural Automatic 50/200 line (Advance Supply) exchange completed automatically.

The first penny inserted actuates a crank arm situated immediately below the coin slots thereby operating the coin-collecting box spring assembly No. 1, see diagrams A.T. 2205 (N1177) and A.T. 2210 (N1182), opening contacts 6-7 and 2-3 and closing contacts 4-5 and 1-2. The opening of contacts 6-7 and closing of contacts 4-5 transfers the short circuit from the coin-collecting box transmitter (No. 21) to the telephone transmitter (No. 1) whilst the opening of contacts 2-3 and closing of contacts 1-2 transfers one end of the induction coil 26-ohm winding from the normal point of connexion to one side of the condenser that is common to the bell and secondary speaking circuits to the centre point of the bell, thus preventing a Caller from using the receiver, after a number has been dialled, as a transmitter, a species of fraud which, if not prevented, would enable the Caller to avoid the use of Button A, see paragraph 174, and ultimately, to recover his fee by pressing Button B, see paragraph 181, on the completion of a call. The penny after rolling down an inclined chute drops into a container where it comes to rest on a pivoted balance arm.

174. On the insertion of the second penny, which rolls down the chute and comes to rest in a similar manner to the first, the combined weight of the two pennies depresses the balance arm thus actuating the coin-collecting box spring assembly No. 2, see diagrams A.T. 2205 (N1177) and A.T. 2210 (N1182), opening contacts 9-10, and removing the short circuit which exists across the dial impulse springs under normal conditions. The Caller is now able to dial the number required. When the called subscriber answers, the Caller should depress Button A momentarily operating the A button lever, thus restoring the coin-collecting box spring assemblies 1 and 2, and causing the coins to be deposited in the cash compartment. On the restoration of spring assembly No. 1 contacts 4-5 and 1-2 open and contacts 2-3 and 6-7 close. The short circuit is, therefore, re-transferred from the telephone transmitter (No. 1) to the coin-collecting box transmitter (No. 21) and the normal connexions of the induction coil are restored. Consequently conversation can now proceed. The connexions at the exchange are released when the receiver is returned to the gravity switch.

175. Calls to an Automatic exchange or to a Rural Automatic 50/200 line (Advance Supply) exchange not completed automatically
These may be Service calls, Emergency (Fire, Police or Ambulance) calls or calls on account of which a higher fee than the minimum for a local call is payable. In either of the foregoing cases the Caller, without previously inserting any coins in the coin-collecting box, obtains the attention of the manual switchboard operator at the automatic exchange or at the exchange with which the rural automatic exchange is associated, as the case may be, by dialling a special digit which, in the case of an automatic exchange is 0, and in the case of a rural automatic exchange may be 7, 8, 9 or 0, according to the junction arrangements at the particular rural automatic exchange concerned. When the dial is revolved until the finger inserted in the special digit hole in the dial number ring comes to rest against the dial stop, the short circuit across the dial impulse spring is removed by the opening of dial springs 15 and 16, see Diagram A.T. 2205 (N1177), consequent upon the operation of the auxiliary cam referred to in paragraph 1679 et seq. The action of the auxiliary impulse control cam is determined by the position of the stud or studs on it, see paragraphs 168 and 169, and Technical Instructions XXV, Part 14C, paragraphs 90 and 91. After the dial springs 15 and 16 have been opened they do not close again until the number of impulses equivalent to the special digit dialled has been transmitted, i.e., until the dial has returned to normal. The calling signal is thus given on the exchange manual switchboard and the operator takes the particulars of the call.

176. If the call is a service or Emergency one the connexion necessary for the completion of the call is immediately set up by the operator and the call proceeds as if it were originated from the ordinary standard automatic telephone, i.e., without the intervention of any of the apparatus in the coin-collecting box at the Call Office.

177. If, however, the call is one for which a fee is payable, the operator, when the call matures, requests the Caller to insert the appropriate fee in the coin-collecting box. Upon the insertion of the first coin the coin-collecting box spring assembly No. 1 is actuated and the functions described in paragraph 173 are performed. Incidentally, spring assembly No. 2 also is operated if the cumulative weight of the coins inserted equals or exceeds that of two pennies but this actuation of spring assembly No. 2 is not necessary for the purpose of the call. The operation of spring assembly No. 1 alone enables the value of the coins inserted to be checked as explained in paragraph 107. When the full 1ee has been collected the Caller is requested to press Button A, the actuation of which causes the deposit of the coins in the cash compartment and the restoration of spring assembly No. 1 and of No. 2 also, if the latter has been operated. The restoration of spring assembly No. 1 re-transfers the short circuit from the telephone transmitter No. 1 to the coin-collecting box transmitter (No. 21) and restores the normal connexions of the induction coil secondary winding. The circuit having thus been restored the can can proceed in the usual manner and standard conditions exist for supervisory and clearing signals. No special cord circuit conditions are required on the automatic manual switchboard.

178. Calls to a rural automatic 25/100 line exchange not completed automatically
These may be Service calls, Emergency (Fire, Police or Ambulance) calls or calls on account of which a higher fee than the minimum for a local call is payable. In any of the foregoing cases the Caller, without previously inserting any coins, obtains the attention of the exchange with which the rural automatic exchange is associated by dialling two special digits of which the first is always 0 while the second digit may be any digit from 1 to 9 according to the junction arrangements at the rural automatic exchange concerned, see Technical Instructions XXV, Part 14B, paragraph 178 et seq. When 0 is dialled the dial springs 15 and 16, see Diagram A.T. 2210 (N1182) are opened consequent upon the operation of the auxiliary impulse control cam referred to in paragraph 167. The opening of dial springs 15 and 16 removes the short circuit from the dial impulse springs and the short circuit from the 75 ohm relay coil, see Diagram A.T. 2210 (N1182), simultaneously. Consequently the relay operates and maintains the dial in a condition which enables the Caller to dial the two special digits effectively and gain the attention of the exchange manual switchboard operator in order to pass the particulars of the call that is being made. Owing to the condition of a particular 75 ohm relay it may remain operated until the clearing signal is given on the return of the receiver to the gravity switch on the termination of the call but as a rule the release of the relay occurs when a reversal of current in the line results from the action of the exchange switching equipment immediately the wanted subscriber replies. With the restoration of the relay and owing to the fact that the dial is at rest springs 15 and 16 being closed, the short circuit across the dial impulse springs is restored but its restoration or otherwise during the progress of the call is immaterial.

179. If the call is a Service or Emergency one the connexion necessary for the completion of the call is immediately set up by the operator and the call proceeds as if it were originated from an ordinary standard automatic telephone, i.e., without the intervention of any of the apparatus in the coin-collecting box at the Call Office.

180. If, however, the call is one for which a fee is payable, the operator, when the call matures, requests the Caller to insert the appropriate fee in the coin-Collecting box. When this action is performed the apparatus in the coin-collecting box functions in accordance with the explanation given in paragraph 177.

181. Ineffective calls to an Automatic exchange or either type of Rural Automatic exchange
If a call is ineffective the Caller obtains the return of his coins on pressing the "Refund" button B. The depression of Button B operates the escapement mechanism restoring the coin-collecting box spring assemblies 1 and 2 permanently and actuating the coin-collecting box spring assembly No. 3 for seven seconds. On the restoration of spring assemblies 1 and 2 the conditions of the speaking and dial circuits revert to normal while the actuation of spring assembly No. 3 disconnects the "B" line for a period of seven seconds, ensuring the clearing of any connexions completed at the exchange automatically or, in the case of a call completed via the automatic manual switchboard, causing the cord circuit supervisory lamp to glow for a corresponding period thus giving a clearing signal at the automatic manual switchboard.

182. Box, Coin-Collecting, No. 14A, Complete. Rate Book Descriptions
The complete coin-collecting box comprises:-
1 Box, Cash, No. 10 (the containing case),
1 Box, Coin-collecting, No. 14 (the mechanism),
and the two items together are known as:-
Box C.C., No. 14A, Complete.

183. The following are the Rate Book descriptions of the items required for the equipment of a subscriber's circuit with a prepayment coin-collecting box:-
In Manual (C.B. exchange areas).
1 Box C.C., No. 14A, Complete.
1 Telephone No. 131 C.B. or No. 182 C.B.
1 Relays and Coils No. 29AO.
1 Bell Set No. 24 (required in conjunction with Telephone No. 182 C.B.
only).

In Automatic exchange areas.
1 Box C.C., No. 14A, Complete.
1 Telephone No. 131 or No. 182.
1 Bell Set No. 24 (required in conjunction with Telephone No. 182 only).
1 Dial Automatic No. 11.
1 Label No. 43A.

In Rural Automatic 50/200 line (Advance Supply) exchange areas.
1 Box C.C., No. 14A, Complete.
1 Telephone No. 131 or No. 182.
1 Relay No. 281AN.
1 Bell Set No. 24 (required in conjunction with Telephone No. 182 only).
1 Dial Automatic No. 11.

In Rural Automatic 25/100 line exchange areas.
1 Box C.C., No. 14A, Complete.
1 Telephone No. 131 or No. 182.
1 Relay No. 281AN.
1 Bell Set No. 24 (required in conjunction with Telephone No. 182 only).
1 Dial Automatic No. 11.

184. General Description
The purpose and function of the Coin Slots, Gong signals, Buttons for the control of the deposition and return of coins and the capacity of the Coin Container are identical with those of the similar items of Box C.C., No. 14, Complete, see paragraphs 106 to 111.

185. Construction of Box, Cash, No. 10 (the containing case)
The box which is constructed of pressed steel is divided into two compartments. The upper compartment accommodates the mechanism, i.e. Box C.C., No. 14, and the lower one forms a receptacle for a cash drawer. Independent access to the two compartments is provided.

186. Access to the mechanism in the upper compartment is obtained by the removal of a detachable front, which, when in position, is secured by a lock. Keys, Lock, J, for use therewith should be requisitioned separately and held by the Engineering Staff for maintenance purposes.

187. The mechanism is hinged in such a way that it can be swung clear of the box for inspection or adjustment or entirely withdrawn, if necessary, for
repair or replacement.

188. The electrical connexions between the hinged mechanism and the connexion strip on which the wiring entering the box is terminated are made by means of a plug and jack. The jack and connexion strip are carried on one mounting plate and the combination can be readily removed from the cash box for maintenance purposes, if required, when the wires on the connecting strip have been disconnected.

189. Cash Drawer and Locks
The cash drawer is fitted with a Lock, No. 10, and a Key, Lock, M, for use therewith is required. For further instructions relative to the key and the conditions attending its use, see paragraphs 214 to 230.

190. Apparatus Lay-out
The arrangement of the apparatus and notices will depend largely upon local conditions but when a wall telephone is provided the arrangement should conform as closely as possible to the appropriate standard Call Office lay-out diagrams, see Technical Instructions XXXVI, Part 1, with the exception that the shell or desk shown on the diagrams referred to will not be provided.

191. In the case of a subscriber's circuit equipped with a Table telephone the Box C.C., No. 14A, Complete, may be fixed to a table or desk or, alternatively, it may be mounted on a wallboard fixed to an adjacent wall. In the former case, i.e., when the box is fixed to a table or desk, the Bell Set No. 24, and the Relays and Coils, No. 29AO, in Manual (C.B.), systems or the Relay, No. 281AN in Rural Automatic systems, should be mounted on a wallboard of suitable dimensions for fixing to a wall. In the latter case, i.e. when the box is mounted on a wallboard for fixing to a wall, the wallboard should be of a size suitable for the accommodation also of the Bell Set, No. 24, and the Relays and Coils, No. 29AO, in the Manual (C.B.) system or the Relay, No. 281AN in the Rural Automatic system. In any circumstances care should be exercised to effect a symmetrical and neat appearance of the general lay-out and whenever a wallboard is provided for the accommodation of apparatus no wiring should appear on the wallboard face.

192. Wiring
Cable E and C.C. n/10 should be used for all wiring between the telephone and the associated apparatus as indicated by diagram C.B. 1422 (N1170), C.B. 1423 (N1171), A.T. 2203 (N1175), A.T. 2204 (N1176), A.T. 2206 (N1180) and A.T. 2207 (N1181) and all the wiring should be run on the rear of the wallboard, full use being made of the holes for leading-in wires provided on the back of the apparatus.

193. Fixing
When a Box C.C., No. 14A, Complete, is fitted on a wallboard it should be secured thereto by means of the four mushroom headed steel bolts 1.5" x 5/16" which are supplied with the box.

194. When a Box C.C., No. 14A, Complete, is to be fitted on a table or desk, the base plate should be removed from the box and screwed to the table or desk by means of three Screws for Wood, Iron, No. 8, Countersunk, of a suitable length. The coin-collecting box should then be placed in position by sliding it on to the base plate, care being taken to ensure that the box is properly secured by means of the catch inside the cash drawer compartment. After the wiring of the coin.. collecting box has been completed the back of the box should be covered by a "Backboard for Box C.C. No. 14A" which should be secured by means of the four mushroom headed steel bolts 1.5" x 5/16" supplied with the coin-collecting box. The backboard is not included with the coin-collecting box and must, therefore, be requisitioned as a separate item.

195. Lighting
Good lighting is essential where a prepayment coin-collecting box is fitted and an endeavour should be made, when necessary, to induce subscribers to provide satisfactory arrangements in this respect.

196. Tests
The schedule of tests to prove the correct operation of the coin-collecting box mechanism in Manual (C.B.), Automatic and Rural Automatic systems is given in Diagrams N1173, N1178 and N1183 respectively.

197. With the exception of the test of the Chutes and Gong for silver coins all necessary tests can be made by means of the present (penny) tokens. The occasions on which tests of the sixpenny and shilling chutes and gong are necessary are expected to be very few and tokens equivalent to those coins are therefore not supplied. When such tests are necessary, however, it is anticipated that Maintenance Officers will. have suitable coins available and by swinging the mechanism forward when making the tests, any risk of coins being deposited in the cash drawer can be avoided.

198. Maintenance
Minor repairs, such as adjustment of spring contacts, escapement, pendulum, balance, counter weight and the clearance of obstruction from the chute can be carried out readily with the mechanism in situ.

199. The escapement should be adjusted by means of the pendulum bob so that Springs Nos. 13 and 14, see Figure 9 (Spring Assembly No. 3) remain open for a period of about seven seconds when the "B" button is depressed.

200. The operation of the balance-arm is controlled by means of a counter weight and the adjustment should be such that the arm is just actuated by the weight of two well-worn pennies.

201. Where repairs of a more extensive character are necessary the mechanism should be replaced under Maintenance Exchange.

202. Fault Records
In order that uniformity of practice in the recording of faults may prevail, the description of the various parts of the mechanism given on Figure 9 and on Diagram E.C. 1415 (N1185), should be used. The entry on a fault card showing the nature and cause of the fault should clearly indicate the part of the coin-collecting box on which the defect occurred.

203. Emergency Call Arrangements are not provided in connexion with subscribers' circuits.

204. Modifications to C.B. Exchange Equipment
Certain modifications to the normal equipment is necessary at C.B. Exchanges when subscribers' circuits are equipped with prepayment coin-collecting boxes. The circuit arrangements are shown by diagram C.B. 1341, Figs. 1-4.

205. When the modifications indicated have been made the conditions at the exchange in connexion with the lines concerned are as outlined in paragraphs 138 to 144 except that paragraph 139 (b) does not apply to subscribers' lines.

206. Operation of circuit in a Manual (C.B.) exchange area
The diagrams referring are:-
Call Office Circuit - Box C.C., No. 14A, Complete, with Telephone No. 182 C.B. - Wiring diagram for C.B. system - C.B. 1423 (N1171).

Call Office Circuit - Box C.C., No. 14, Complete, with Telephone No. 131 C.B. or Box No. 14A, Complete, with Telephone No. 131 C.B. or Telephone No. 182 C.B. - Explanatory diagram for Manual (C.B.) system - C.B. 1424 (N1172).

Exchange end, line and cord circuits, Explanatory - C.B. 1241.

Telephone No. 131 C.B. - C.B. 1429 (N231) panel 1.

Telephone No. 182 C.B. - C.B. 1426 (N282) panel 1.

Bell Set No. 24 - C.B. 1425 (N524).

207. The conditions attending the establishment of a call originated from a. subscriber's telephone equipped with a Box, Coin-Collecting, No. 14A, Complete, the operation of the apparatus and the operating procedure are precisely the same as those which are relevant to a call from a Call Office where a Prepayment Box, Coin-Collecting, No. 14, Complete, or No. 14B, Complete, is installed and are as described in paragraphs 147 to 160 inclusive.

208. Automatic exchanges, Rural Automatic 25/100 Line Exchanges and Rural Automatic 50/200 (Advance Supply) Exchanges
The instructions in paragraphs 162, 163 and 164 apply equally to a subscriber's line equipped with a Box, Coin-collecting, No. 14A, Complete.

209. Operation of circuit in an Automatic or Rural Automatic Exchange area
The diagrams referring are:-
Call Office Circuit - Box, Coin-Collecting, No. 14, Complete, or Box, Coin-Collecting, No. 14A, Complete, with Telephone No. 131 - Wiring diagram for Automatic system - A.T. 2203 (N1175).

Call Office Circuit - Box C.C., No. 14A, Complete with Telephone No. 182 - Wiring diagram for Automatic system - A.T. 2204 (N1176).

Call Office Circuit - Box, Coin-Collecting, No. 14, Complete, with Telephone No. 131 and Box, Coin-Collecting, No. 14A, Complete, with Telephone No. 182 - Explanatory diagram for Automatic system - A.T. 2205 (N1177).

Call Office Circuit - Box, Coin-Collecting, No. 14, Complete, or Box, Coin-Collecting, No. 14A, Complete, with Telephone No. 131 - Wiring diagram for Rural Automatic system - A.T. 2206 (N1180).

Call Office Circuit - Box, C.C., No. 14A, Complete, with Telephone No. 182 - Wiring diagram of Rural Automatic system - A.T. 2207 (N1181).

Call Office Circuit - Box, Coin-Collecting, No. 14, Complete, with Telephone No. 131 and Box, Coin-Collecting, No. 14A, Complete, with Telephone No. 131 or No. 182 - Explanatory diagram for Rural Automatic system - A.T. 2210 (N1182).

Telephone No. 131 - A.T. 2209 (N231) panel 2.

Telephone No. 182 - A.T. 2008 (N282) panel 2.

Bell Set No. 24 - C.B. 1425 (N524).

It should be noted that diagrams A.T. 2203 (N1175) A.T. 2204 (N1176) and A.T. 2205 (N1177) refer to Rural Automatic 50/200 (Advance Supply) Exchanges as well as to ordinary automatic exchanges and that diagrams A.T. 2206 (N1180), A.T. 2207 (N1181) and A.T. 2210 (N1182) refer only to Rural Automatic 25/100 Line Exchanges.

210. Type of Dial
The explanation given in paragraphs 167, 168 and 169 apply also to the Dial, Automatic No. 11, fitted on telephones associated with prepayment coin-collecting box lines terminating on subscribers' premises.

211. Normal Conditions
These are shown by Diagrams A.T. 2205 (N1177) and A.T. 2210 (N1182) and the explanation given in paragraph 170 applies equally to subscribers' circuits equipped with Boxes, Coin-collecting No. 14A, complete.

212. The mechanical features of Box, Coin-collecting, No. 14A, Complete, are exactly the same whether used for Manual (C.B.) or automatic working and the mechanism, Box C.C. No. 14, used on one system is interchangeable with one used on the other system without alteration. No special relays or coils are required at the subscriber's end to meet Automatic and Rural Automatic 50/200 Line (Advance Supply) Exchange conditions but to meet the conditions at Rural Automatic 25/100 Line Exchanges it is necessary to provide and fit a relay No. 281 AN at the subscriber's end and to connect it as shown by diagrams A.T. 2206 (N1180) and A.T. 2210 (N1182).

213. Operation of the circuit
The operation of a subscriber's circuit fitted with a Coin-collecting Box, No. 14A, Complete, is precisely similar to that of a Call Office circuit fitted with a Coin-collecting Box, No. 14, Complete, or No. 14B, Complete, and the explanations given in paragraphs 172-181 therefore apply.

Box, Coin-Collecting, No. 14, Complete, with Telephone No. 218

The Telephone No. 218 was introduced circa 1933 and was used with the Box, Coin-Collecting No. 14 on various types of exchange line.

This was the first Bakelite telephone to be adopted for use with Box, Coin-Collecting use.  The Bellset No. 30 was also used with this telephone.

For CB working a Relays and Coil No. 29AO was also used and for UAX 5 & 6 working a Relay No. 281AN was fitted.

The Telephone No. 218 was superseded in 1935 by the Telephone No. 238.

Wiring Diagrams
N1191 - Manual CB systems.
N1192 - Manual CB systems (explanatory).
N1193 - Automatic systems.
N1194 - Automatic systems (explanatory).
N1195 - UAX No's 5 & 6.
N1196 - UAX No's 5 & 6 (explanatory).
 

P.O. ENGINEERING DEPT.
ENGINEERING INSTRUCTIONS
TELEPHONES
CALL OFFICES
D3001
Issue 4, 21.10.60

COIN-COLLECTING BOX INSTALLATIONS
(PRE-PAY-ON-ANSWER WORKING)

Apparatus for Use in Public Call Offices and at Subscribers Coin Box Installations

2. Scope of Instruction
This Instruction describes the various types of call-office equipment in current use for the following systems and conditions:-

• Automatic (including U.A.X.) exchange areas

• C.B. manual exchange areas

• C.B.S. and magneto exchange areas

• Over radio links working into (a) or (b)

• Exchange conversions.

The relative diagrams for various systems and conditions are detailed in the index of N diagrams and installation instructions are contained in D 3003.

3. Standard types of coin-collecting box
Basically, two types of coin-collecting box are available: prepayment and postpayment.

(a) Prepayment types (par. 4)
These are used in automatic exchange and C.B. manual exchange areas. In automatic exchange areas, the insertion of the unit-call fee prepares the circuit for dialling operations.  In C.B. manual exchange areas, the insertion of the unit-call fee causes the exchange calling signal to operate.  In the former case, the telephone transmitter is rendered inoperative and in the latter, is put under the operator's control.  In both cases, the receiver is shunted to make it less effective as a transmitter and a tone transmitter is brought into circuit so that, on operator-controlled calls, the operator can listen for the insertion of additional coins. 'A' and 'B' buttons are provided and operation of either will restore the normal transmitting and receiving conditions.  Additionally, the operation of the 'A' button deposits the coins in the cash box, while operation of the 'B' button disconnects the line for 5 to 7 seconds and causes all coins to be returned to the caller.

(b) Postpayment types (par. 5)
These are used in C.B.S. and magneto exchange areas.  They are designed to give tone signals to the exchange operator when coins are inserted and to render the telephone transmitter inoperative during this period.  The coins are not inserted until the operator demands them and a suitable notice is provided to this effect. 'A' and 'B' buttons are not fitted on this type of coin-box but a refund chute is provided so that coins which are rejected by the coin -gauges are returned to the caller.  Prepayment and postpayment boxes are available for use at public and subscribers' premises.  Those suitable for use in public call-office installations have a cash compartment and a flush-fitting side lock; those for subscribers' premises have a cash drawer, the key of which is supplied to the subscriber by the T.M. (Clerical Division).

Box, Coin Collecting, No. 14D	Box, Coin Collecting No. 14G
Box, Coin Collecting, No. 16B	Box, Coin Collecting, No. 16C

Close-up of pre-decimal coin plate

4. Details of prepayment types of multi-coin box.
Particulars of these will be found in the Rate Book and only a brief description of the main features and use of each type is given here.

Box, Coin-collecting, No. 14.., complete
This is used in automatic exchange and C.B. manual exchange areas.  Normally, unless special instructions are received, Box, Coin-collecting, No. 14D, complete should be requisitioned and fitted in public call offices and Box, Coin-collecting, No. 14E, complete should be requisitioned and fitted at subscribers' coin-box installations.  The front cover is a Box, C.C. Part: Front, No. 5.

Box, Coin-collecting, No. 14G, complete is fitted only at public call offices where difficulties have been experienced due to obstructions being placed in the refund chute.  It includes a Box, C.C. Part: Container No. 16A which has a glazed refund tray and requires a special front (Box, C.C. Part: Front, No. 8).  In other respects, this coin box is similar to Box, Coin-collecting, No. 14D, complete and the method of assembling and fitting the various parts is similar.

The appropriate bell-sets, which must be requisitioned separately, are described in par. 7.

Boxes CC Mechanism No. 14 (pre-decimal)

5. Details of postpayment types of multi-coin box.
Particulars of these will be found in the Rate Book and, therefore, only a brief description of the main features and use of each item is given here.

Box, Coin-collecting, No. 16, complete
This is fitted in public call offices and subscribers' coin-box installations in C.B.S. and magneto exchange areas.  These items are provided with a plain black front (Box, C.C., Front, No. 2) containing a refund cup.

Box, Coin-collecting, No. 16B, complete
This is fitted at public call offices and comprises Box, C.C., Part: Container, No. 8A, Box, C.C., Part: Front, No. 2 and Box, C.C., Part: Mechanism, No. 16.  As this mechanism occupies less space in the Container No. 8A than Mechanism No. 14, a Box, C.C., Part: Chute, No. 1 is provided.  This is an enclosed channel, forming an extension to the money funnel, through which coins are directed, via the money funnel, into the cash compartment.  A Box, C.C., Part: Adapter, No. 1 is also provided in order to close the 'B' button aperture (not required) in the side of the Container No. 8A and to act as the lower hinge support for Mechanism No. 16.

Box, Coin-collecting, No. 16C, complete
This type is fitted on subscribers' coin-box installations.  The container is Box, C.C., Part: Container, No. 10A, designed to take the cash drawer Box, C.C., Part: Tray, No. 1.  The chute extension, adapter and mechanism provided are as described for Box, C.C., No. 16B, complete.

Bell-sets, which must be requisitioned separately, are described in par. 7.

6. Variations on standard types of coin-collecting box
(a) Box, Coin-collecting, No. 17A, complete
This is a prepayment type equipped with a special latch-in multi-way plug and socket so that, when the mechanism is swung out for inspection, test or adjustment, the electrical circuit remains continuous.  Apart from the association of this latch-in plug with the mechanism (and the need for a bell-set equipped with the corresponding latch-in socket, i.e. a Bellset No. 42), there are no other differences between this coin-box and Box, Coin-collecting, 14D, complete.  The mechanism, equipped with the latch-in plug, is coded Box, C.C., Part: Mechanism, No. 17.  These are at present on field trial and should not be requisitioned until they appear in the Rate Book.

(b) Box, C.C., Part: Mechanism, No. 18
Differs from a Box, C.C., Mechanism, No. 14 only in that the sixpenny runway is designed to reject American and Canadian one cent pieces.  It is available for use at the T.M.'s discretion; because of its extra cost, it must not be used indiscriminately.

(c) Box, C.C., Part: Adapter, No. 2
Consists of a mild-steel plate with turned-down side and end flanges which act as guides.  It has a coin aperture to coincide with the aperture in the centre platform of Box, C.C., Part: Container, No. 8A.  It is used with a Box, C.C., Part: Container, No. 8A or Container, No. 16A to enable a Container, Cash, No. 2 to be fitted. In the case of a Box, C.C., Part: Container, No. 8A, Mark 1 or Box, C.C., Part: Container, No. 16A, Mark 1, the procedure is as follows:-

The spreader bar and bracket, and the scraper plate, are removed from the cash compartment.  The existing money funnel is removed from the mechanism compartment, and Box, C.C., Part: Money Funnel, No. 1 fitted.  The adapter is secured by two special screws (supplied with the adapter) to the right-hand side of the cash compartment, using the lower two holes left by removal of the scraper plate.

The rear trapped screws on top of the adapter function as two of the fixing bolts for the Box, C.C., Part: Money Funnel, No. 1. The front fixing is effected by using the two round-head un-slotted No. 4BA screws and nuts supplied with the money funnel.  Finally, all screws are tightened securely.  In the case of a Box, C.C., Part: Container, No. 8A, Mark 11 or Container, No. 16A, Mark II, the Box, C.C., Part: Money Funnel, No. 1 is already in place and no spreader bar or scraper plate is fitted, otherwise the fitting procedure is as above.

(d) Box, C.C., Part: Money Funnel, No. 1
Differs from the money funnel fitted in Box, C.C., Part: Container, No. 8A, Mk. I in that it is sloped at the back to reduce the money aperture to the same size as that provided in the Container, Cash, No. 2.

(e) Container, Cash, No. 2
This is a metal box which automatically seals itself when it is removed by a collector from the cash compartment of a Box, C.C., Part: Container, No. 8 or Container, No. 16 equipped with a Box, C.C., Part: Adapter No. 2.  It is not supplied with Box, Coin-collecting No. 14, complete and must be requisitioned only by the T.M. (Clerical Division) or by the Head Postmaster, in accordance with Tp.S.I.G3XV 8-15. It is not to be held by engineering staff, but only by the coin-collecting organisation. Click here for more details on Container, Cash No. 2

(f ) Box, C. C., Part: Scraper, No. 1
This is a scraper plate for fitting into a Box, C.C., Part: Container, No. 8A, Mark II or Container, No. 16A, Mark II, when these are to be used without a Container, Cash, No. 2.  It has three captive screws and is fitted into the right-hand side of the cash compartment of the container by screwing these screws into the holes there provided.  The captive washers are not removed and act as spacers between the scraper plate and the side of the container.

7. Bell-sets
Bell-sets now fit into the mechanism compartments of all. standard coin boxes (NOTE: Where Boxes, Coin-collecting, No. 16 or No. 16A complete are still in use, an external Bellset, Bellset No. 31,will be required).  The Bellset components are assembled on to a metal base-plate, having slotted holes which permit the Bellset to be fixed, by means of the screws provided, in the back of the coin collecting box mechanism compartment. The correct Bellset for any particular installation can be readily ascertained from Table 1.  The individual items included in each of the Bellsets are shown on the relative diagrams and are also detailed against the respective entries in the Rate Book.

(a) Method of mounting Bellsets Nos. 33, 34, 35 and 36 in coin-collecting box
The mounting plate on each of these Bellsets (a Bellset No. 34 is shown mounted in a BCC No. 16B in the picture to the right - this is probably a pre-production picture) is provided with three keyholes slots, so positioned as to register with three tapped holes in the back of the coin-box mechanism compartment.  The fixing screws are provided with each Bellset.  To fix the Bellset the three screws should be secured by a few turns only into their respective holes, the Bellset then hung over the screws by the three keyhole slots, the plate being behind the head of the screws and the weight of the bell-set resting on the bottom shelf of the mechanism compartment.  The weight of the Bellsets must not be supported solely by the three screws.  The screws should then be tightened up securely.

(b) Accurate location of the plug
Location of the mechanism with the jack on the bell-set (except when latch-in type plugs and sockets are fitted) can be achieved on Bell-sets Nos. 33, 35 and 36, i.e. those used with the prepayment mechanism, by making the following adjustments after the bell-set has been securely fitted in the mechanism compartment of the coin-box.  Before fitting Box, C.C., Part: Mechanism, No. 14 into position, slacken off the two screws securing the plug-mounting bracket to the front plate of the mechanism.  The plug is now free and, when the mechanism is fitted and swung into the coin-collecting box, it should be possible to accurately register the plug with the jack on the bell-set.  When this has been done, the plug should be secured firmly in position by tightening up the two fixing screws previously loosened.  Where latch-in plug and socket connections are provided, e.g. Box, C.C., Part: Mechanism, No. 17 and Bellset No. 42, the plug must be carefully but firmly pressed home into the socket until it is latched.  To remove the plug from the socket, insert a screwdriver blade into the hole provided and with the flat of the blade press against the latch until the plug is unlatched and further movement of the blade causes the plug to part from the socket.

(c) Bellset No. 31
Used in magneto exchange areas, cannot be fitted inside the coin box.  It is mounted on the wallboard in the position shown in Diagram EC1586 for cabinets and EC1582 for Kiosk No. 6 (see D 3003).

(d) Bellset No. 34
Used in association with the postpayment mechanism (Box, C.C., Part: Mechanism, No. 16), is connected to the latter by means of a short length of PVC covered Wire, sufficient length being allowed for the mechanism to be swung out of the container for maintenance attention.

(e) Bellset No. 35
This Bellset has provision for mounting additional Resistors, Coil, No. 12 which are required when this type of Bellset is fitted in a public call office requiring 'Emergency Call' facilities.  Two screws are provided with the Bellset for fixing the additional resistors and the necessary wiring for connecting them is included in the wiring form.  The ends of these wires are protected with insulating tape and tied back.  The resistance values of the Resistors, Coil, No. 12 required are shown in Diagram N2406.

(f) Bellset No. 40
These are fitted temporarily in a coin-collecting box for use during the conversion of a C.B. exchange to automatic working when conversion of the coin-collecting box installations cannot be made in advance of the main transfer (A 3110).

(g) Bellset No. 42
Similar to Bellset No. 33, except that it is equipped with a latch-in type of socket for use with Mechanism, No. 17 in Box, Coin-collecting, No. 17A, complete.

8. Telephones and cords

(a) Public call offices
The present standard handset cord for public call offices is Cord, Instrument, No. 3/99BN, 26 in. Trials are in progress on improved types of cords, and the Rate Book should be consulted before ordering handset cords.

(b) Subscribers' call office installations
The handset cord is Cord, Instrument, No. 3/163A, Brown, 42 in.

(c) Telephones and telephone cords
Those required for public and subscribers' installations are shown in Table 2 below.

9. Dials
Dials, Automatic, No. 13 or No. 20 LA are used and Stations, A 3118 describes the circumstances in which each is fitted.

10. Bases for Telephones Nos. 196, 238 and 242
The bases used for these telephones are set out in Table 3 below.

11. Radio links
The appropriate equipment giving prepayment or postpayment facilities, as required, and provided with a L.B. telephone, is shown in Tables 1 and 2.  For postpayment working, Box, C.C., Part: Label, No. 306 should be fitted, as described in A 3006.

12. Locks and keys for coin-collecting box fronts and cash compartments
The provision and safeguarding of locks and keys is described in E. I. Telephones, Call Office D 3005.

Lock No. 6 fitted to coinbox

13. Fitting of Locks No. 15 to Containers, Cash No. 2
D 3902 describes the fitting of these locks, which are in all other respects a Chief Clerk's or Head Postmaster's responsibility.

TABLE 1

TABLE 2

TABLE 3

Notes:-
Part No. 1/SBA/1 (Drawing SBA/1) is a baseplate with no drawer or rubber feet.  It has two deep screws, which are used to fix the telephone to the base.  The base is firstly fixed to the container with four wood screws and the telephone placed on top.  The telephone is then secured by the deep screws which are accessible from the underneath of the top of the container.

Part No. 1/SBA/2 (Drwaing SBA/2) is a baseplate with no drawer.  The telephone is fixed to the baseplate and then placed onto the Bracket, Telephone No. 12.  The plate fitted to the back of the bracket is then lowered and secured by two screws.  Once secure the telephone cannot be removed from the bracket.

Wiring Diagrams
Magneto - N2403.
Manual CB - N2406.
UAX No's 5 & 6 - N2407.
Automatic - N2408.
CBS 2 & 3 - N2409.

Additional Information

The cases were phosphate etched and then painted with 3 coats of Stove Enamel Black on the front faces and 2 coats on the rear.  On the front cover the characters and indicator lines were filled with Stove Enamel white paint.

Last revised: December 31, 2024