P.O. ENGINEERING DEPT.
ENGINEERING INSTRUCTIONS
TELEPHONES
CALL OFFICES
D 3003
Issue 5, 19.12.60
CALL OFFICES AND SUBSCRIBERS'
COIN-BOX INSTALLATION
(PRE-PAY-ON-ANSWER WORKING)
Installation of Wallboards and Associated Equipment
1. Scope of Instruction
This Instruction describes the installation of
wallboards and associated equipment in Kiosks
Nos. 1, 2, 3, 4 and 6, cabinets,
recessed call offices, and subscribers' premises. The equipment
used is
described
in Telephones, Call Offices D 3001.
2. Types of wallboard
Table 1 lists the wallboards described in this
Instruction and the circumstances in which they are used. Typical wallboards are
illustrated below.
 |
FIG. 1 |
 |
|
 |
FIG. 2 |
|
FIG. 3 |
TABLE 1
Wallboard |
Described in pars. |
Illustrated by Fig. No. |
Use of wallboard |
D1/60577 |
3-11 |
1 |
Upper wallboard for public call offices
in all areas |
D2/60577 |
12-22, 30 |
1 |
Lower wallboard for automatic C.B. and
C.B.S. areas; also used in Plan 2G installations in
magneto areas |
D1/63747 and
D2/63747 |
23 |
- |
Generally similar to D1, and D2/60577
but 2 ft. 2 in.
wide. Used in narrow cabinets in all areas
except magneto |
D90650 |
24-27 |
2 |
For use in subscribers' premises in the
London director area and its fringe charging group
where three notice frames are required |
D90651 |
28 |
3 |
For use in subscribers' premises
(except in magneto areas) where two notice frames are
required |
Wallboard ... in. x ... in. |
29 & 31 |
- |
For use in public call offices and
subscribers' premises in and magneto areas |
Backboards No. 1 |
32 |
- |
Used where a coin-collecting box is
fitted on a table or No. 1 desk |
WALLBOARD D 1/60577 AND ASSOCIATED ITEMS
3. General
This wallboard comprising the upper half of a complete wallboard
assembly
includes two Frames, Notice, No. 29, a Frame, Notice, No. 30 and
a Frame,
Notice, No. 31. Glasses No. 49 for use with the Frames, Notice,
No. 29 must be
requisitioned separately but the other glasses are supplied with
the wallboard. The wallboard should be fitted after the lower wallboard is in
position, care
being taken to ensure that the tongue and groove is clean so
that a close fit is
obtained.
4. Fitting In Kiosk No. 6
The wallboard is secured to four bosses on the
back panel by screws supplied with the kiosk.
5. Fitting In Kiosks Nos. 1, 2, 3 and 4
The wallboard is screwed to wooden
battens on the back panel by Screws for Wood, Iron Blued Rd.
Hd. 1.25 in., Size 14.
In Kiosk Nos. 1 and 3 the battens, are supplied with the kiosk. In Kiosks Nos. 2
and 4 Battens, Wallboard, D60577, which include the necessary
fixing screws,
should be secured to bosses on the back panel.
6. Fitting in cabinets and recessed call offices
The wallboard is fitted to wooden battens (4ft. x 3in. x 1in.) which must first be
secured to the
back panel by four Screws for Wood, Iron Blued Rd. Hd., 11 in.,
Size 14. The
battens should be mounted vertically at 23.5 in. centres with
their lower ends 2ft. 4in. from the floor level. (For alternative positions in
recessed call
offices see Drawing ES 5686.)
7. Instruction cards and notices
The various instruction cards and notices
are described in A 3006.
8. Frames, Notice, Nos. 29, 30 and 31
The notice frames are mounted on
Brackets, Mounting, DQ... and DH.... which are secured
horizontally to the
wallboard by screws, one at the top and the other at the bottom
level of the
frame. The frame, the notice, covering glass and backing of
pasteboard sheet are
supported by the brackets. The top of the frame engages with the
Bracket,
Mounting, DQ... by means of two dowels, and is secured at the
bottom by two
tongues which engage with a spring clip in the Bracket,
Mounting, DH... Removal
and replacement of the frame is affected with a Key Frame,
Notice, No. 29 the use
of which is described in D 5901.
9. Replacement of mirror
For security against theft, the Frame, Mirror, No.
1 (Drawing 60592) is provided with four mild-steel screws, welded to it, one at
each corner.
These screws pass through holes in the wallboard and are secured
at the back by
nuts and washers. To replace a broken mirror, it is necessary to
remove these
nuts and washers, withdraw the frame, fit the new mirror and
then replace and
secure the frame.
10. Emergency button [C.B. (manual) areas only]
A Label No. 231 and
Press-button G, Brass, with Watertight Barrel will be provided
in the Frame, Notice, No. 31, on the upper part of the
wallboard. A suitable hole to take
the barrel of the press-button and two 1 inch starting holes for
the fixing
screws are already drilled in the correct position in the
wallboard. To conform
to the general colour scheme of the layout, a cap with the Rate
Book title Part
No. 1/SCA/1 is fitted over the press-button to cover up the
brass flange. Part
No. 1/SCA/1 includes two Screws for Wood, Brass, Rd. Hd., 1in.,
Size 4. See picture below.

K6 Kiosk with Jubilee interior configured for
CB Exchange working.
The difference with the CB configuration is that there is no dial on
the
telephone and an emergency button is fitted under the mirror in the
emergency frame.
11. Method of securing the press-button, cap and emergency
label
Remove the
Frame, Notice, No. 31 and recover the glass completely (the
glass is not
required where the emergency button is fitted). Label No. 231
should then be
placed in position, and the press-button passed through the hole
in the label
and the corresponding hole in the wallboard. The cap should then
be placed over
the flange on the press-button and the whole secured by means of
the two screws
supplied with the cap. The frame should then be replaced.
WALLBOARD D 2/60577 AND ASSOCIATED ITEMS
12. General
This wallboard comprising the lower half of a complete assembly
includes
a Container No. 1 and a Container No. 2 for housing directories
and parcels. It
carries a coin-box container mounted centrally between them and
a telephone on
the top shelf of the left-hand container. Before the wallboard
is secured the
telephone should be fitted (see par. 15) and the telephone cord,
line wires, and
earth wire threaded through the hole provided. In Kiosks Nos. 2,
4 and 6 (Mk. 1)
the precautions described in C 5905 should be taken where it is
considered that
damage may be caused by attempts at forcible removal of the coin
box.
13. Fitting In Kiosks No. 6
The wallboard is secured to four bosses on the
kiosk back panel by screws supplied with the kiosk. In Kiosks
No. 6 (Mark 2) the
coin box is secured to a further four bosses (see par. 16). An
earth wire should
already be bolted to the central boss (see C 3001).
14. Fitting In Kiosks Nos. 1, 2, 3, 4, cabinets and recessed
call offices
The
wallboard should be secured to battens on the back panel by four
Screws for
Wood, Iron Blued Rd. Hd., 1.25in., Size 14. When fitted, the top
faces of the
containers should be 3ft. 8in. from the floor. Pars. 5 and 6
describe the
fitting of the battens.
15. Telephone
The telephone is fitted to the top shelf of the left-hand
container of the wallboard, in
which seven holes are provided for the purpose. The type of
telephone to be fitted is shown in D 3001. The telephone is
supplied
without the base and it is necessary to requisition one Part No.
1/SBA/1. This
base should first be secured, by means of the four screws which
are supplied
with it. The body of the telephone should then be placed on the
base and secured by means of the two trapped screws in the base;
access to these
screws is gained through the two holes provided in the shelf. The telephone cord
should be passed down through the remaining hole in the shelf,
thence through
the back panel of the wallboard inside the receptacle, along the
back of the
wallboard, and into the coin box through the hole in the back of
the box.
16. The coin-box container
In a Kiosk No. 6 (Mk. 2) the coin box is mounted on the
wallboard in the following
manner:-
The 5/15in. x 2in. grub-screw supplied with the kiosk should be
screwed through the top
left-hand coin-box fixing hole in the wallboard into the boss on
the back panel
and tightened, using a screwdriver (this grub-screw should have
been left in
position by the kiosk erection party). The container is then
hung on the
grub-screw while three 5/16in. bolts (Boxes C.C., Parts: Bolts
No. 2A which are
requisitioned separately) are screwed through the wallboard and
tightened with a
Spanner, Box, No. 5. The nuts and washers supplied with the
bolts should be
discarded, except for one nut and washer, which are used on the
grub-screw, to
complete the fixing of the container. An entry hole in the back
of the coin box
aligns with the hole in the wallboard through which the line and
earth wires
have been run. In other installations, except where precautions
against forcible
removal have been taken (see par. 12), the coin box should be
bolted to the
wallboard using the bolts requisitioned with the coin box before
the wallboard
is fitted. The bolts should be fitted with their heads on the
coin-box side of
the wallboard and tightened with a Spanner, Box, No. 5 and a
Spanner, Box, No.
5A.
17. Box C.C., Parts: Lock No. 39
A Lock No. 39 should be fitted to the
mechanism compartment front. The position of the bolt-retaining
bar should be
carefully adjusted so that the lock operates smoothly. On early
type boxes the
bar is held by two screws, the heads of which are in the cash
compartment; by
slackening these screws the position of the bar can be adjusted,
after which the
screws should be fully tightened. On the later type coin boxes
the bar is held
by two screws having heads countersunk into the bar, and these
should be
slackened sufficiently to allow the bar to be adjusted and then
be re-tightened.
Excessive slackening should be avoided as this may cause the
securing bar in the
cash compartment to drop off. Before leaving an installation the
fitter should
satisfy himself that the cash compartment is secured by the lock
provided. E. I. Telephones, Call Offices D
3005 describes the provision of locks and keys.
18. Bell-set and mechanism
The appropriate Bellset (see D 3001) is mounted
in the coin-box container as follows:-
The three fixing screws provided with each bell-set are
temporarily secured
by a few turns only into the holes provided in the back of the
coin-box
container. The three keyhole slots in the bell-set base plate
are fitted over
the screws, so that the slots are behind the heads of the screws
and the weight of the bell-set is taken by the bottom of
the mechanism compartments. The screws are then tightened. The
telephone cord,
line wires, and an earth wire should pass through the hooded
hole provided in
the centre of the bell-set base plate, and be connected in
accordance with the
appropriate diagram.
NOTE:- The line wires must run directly to the bell-set,
with no intermediate connecting point, except when a protector
is necessary (see
par. 21).
The mechanism is fitted by placing its hinge pins in the holes
in the lugs on
the right-hand side of the coin-box container. In prepayment
types the plugs on
the mechanism must be aligned with the jack on the bell-set. This is done by
slackening the two screws securing the plug-mounting bracket to
the mechanism,
and by mating the plug points with the correct jacks as the
mechanism is swung
into the container. When the mechanism is fully home, the
bracket fixing screws
are re-tightened; after this the plug should engage correctly
whenever the
mechanism is swung in.
It is necessary to connect an earth to the mechanism frame by
running a wire
between the earth tag on the spring-set assembly block to spring
No. 8 or No. 11
of the spring-set. See the appropriate wiring diagram.
19. Batteries
When a local battery telephone is to be provided, Cells,
Leclanché, R40 should be fitted at the back of the left-hand
container; the
space available is insufficient to accommodate cells larger than
the R40. The
cells should be protected and hidden from view by a Partition D60967 (see par. 20) which is secured to the
container in front of the cells. Where only two cells are
provided, they should
stand vertically; where three cells are necessary, however, they
should be
placed on their sides one above the other. The cells should rest
on the rubber
mat supplied with Partition D60967. A hole for leading-in the
battery wires
should be drilled in a suitable position in the back of the
wallboard. (For this
purpose, and whenever small holes need to be drilled in the
wallboard locally, a
twist drill will be found to be more satisfactory than a
carpenter's bit).
20. Partition D60967
This is a sheet of plywood 1 ft. 7/8 in. x 7 5/8 in. provided
with clips, a black leather tab and a locking
screw. Two metal angle strips (one of which has a tapped hole to
engage the
partition locking screw), the necessary fixing screws and a
small rubber mat are
also included.

The battery compartment is on the left.
This is the Partition D60967.
The mechanism is thought to be a trial setup as it has an integral
generator which was never adopted.
The two metal angle strips should be screwed vertically one to
each side of
the container, the front edges of the strips each being 2.75 in.
from the back
edge of the side; the strip carrying the tapped hole which
engages the locking
screw should be fixed on the right, and the other strip on the
left. The
partition can then be placed in position with the clips engaging
the left-hand
metal strip, and secured by means of the locking screw. The
black leather tab is
provided to assist in the removal of the partition See picture
above).
21. Protector
When a protector is necessary, a Protector and Fuse No. 12
should be provided. It should be screwed to the wallboard inside
the left hand
container with its length horizontal, touching the right-hand
side of the
container and with its uppermost edges as near as possible to,
but not
obscuring, the leading-in hole for the telephone cord. After the
base of the
protector has been screwed in position, three 1/4 in. holes
should be drilled
through the wallboard for the entry of the two leads and earth
wire, the
respective holes in the base of the protector being used as a
template (Diagram EC1851 refers). The protector should be hidden from view by a
Partition, D60967,
fitted as described in par. 20.
NOTE:- A terminal block must not be inserted at the lead-in
point, since this
would facilitate those methods of fraud which require access to
the line wires.
22. Directories
The directories will normally be placed in the right-hand
container. In London both containers may be used.
WALLBOARDS D 1/63747 AND D 2/63747
23. General
These wallboards are similar in layout to the D1/60577 and D2/60577,
including the same notice frames and Containers No. 3 and 4 but
are 2 ft. 2 in.
wide. Two 3 ft. 10 in. x 3 in. x 1 in. wooden battens should be
fitted to the
back panel of the cabinet. The wallboards should be fitted to
the battens in the
manner described in pars. 6 and 14. When securing the battens to
the back panel
care must be taken to ensure that when the wallboard is secured
in its correct
position the battens are completely hidden so as not to spoil
the general
appearance of the layout.
24. This wallboard for use in subscribers' premises is 15 in.
wide and 30 in.
high and includes two Frames, Notice, No. 30 for instruction
cards and one
Frame, Notice, No. 31 for the emergency notice.
All notice frames are complete with glass, pasteboard sheet and
mounting
brackets. The Frames, Notice, No. 30 are secured by a Bracket,
Mounting, DH, 6.5
in. at the top and by a Bracket, Mounting, FC at the bottom. The
lower bracket
provides a 'snap off/on' action for the frame, to enable the
subscriber to
replace the instruction card as necessary. The frame may be
removed by pulling
the lower end clear of the bracket and then lifting the frame so
that the lugs
at the upper end are removed from the top bracket. Frames No. 30
which have this
method of removal can be identified by the two holes which are
visible in the
top edge of the frame. The Frames, Notice, No. 31 are held by a
Bracket,
Mounting, DQ, 6.5 in. and Bracket, Mounting, DH, 6.5 in. They
require a Key,
Frame, Notice, No. 29 for the removal of the frame (see D 5901). The wallboards
have an ebonised finish and are drilled for the cable holes, an
emergency button
(fitted in the manner described in par. 10), the fixing screws
of a Bracket,
Telephone, No. 12 (Screws for Wood, Steel Japanned Rd. Hd., 1
in., Size 8) and
three of the bolts for the coin-box container. The 4th bolt hole
of the coin-box
container coincides with one of the four holes provided for
securing the
wallboard to the wall. The top two fixing points are concealed
behind the notice
frames. Directory holders are not included in the wallboard.
25. Associated items
The type of telephone and coin box to be used is given
in D 3001. The remainder of the associated items are listed in
Table 2.
TABLE 2
Item |
When
required |
1 x Bracket, Telephone, No. 12 |
Except when the telephone
is to stand on a table |
1 x Part No. 1/SBA/2 |
When the telephone is
fitted to a Bracket, Telephone,
No. 12 |
1 x Base, Telephone, No. 1/162
Black |
When the telephone stands
on a table |
1 x Box, Battery, No. 3 &
Cells. Leclanché, R40 |
In local battery
installations |
1 x Press-button G,
Brass with Waterproof Barrel
1 x Labels No. 231 are required
1 x Part No. 1/SCA/1 |
In C.B. areas when emergency
calling facilities |
26. Fitting
The wallboard should be secured to the wall by four Screws for
Wood, Iron, 2.5 in., Size 12 so that the top of the coin-box
container is 3ft. 8in. from the floor level.
27. Protectors
The protector must be fitted in the usual position near the
point of entry of the lead-in, but it should be as inaccessible
as possible to a
user of the coin box, and it may be desirable, therefore, to
select the point of entry with this requirement in mind.
WALLBOARD D90651 AND ASSOCIATED ITEMS
28. General
This wallboard is 15in. wide and 25.75in. high and includes
one Frame,
Notice, No. 30 and one Frame, Notice, No. 31. It is otherwise
similar to the
Wallboard D90650 and the instructions given in pars. 24-27
apply.
MISCELLANEOUS
29. Public call offices in magneto areas
Apparatus wired to Diagram N2409 is
standard for all public call offices in magneto areas. The
layout should conform
to the following diagrams:-
Kiosks Nos. 1 and 3 - EC 1588
Kiosks Nos. 2 and 4 - EC 1587
Kiosk No. 6 - EC 1852
Cabinets - EC 1586
In a Kiosk No. 6 (Mark 2) it will first be necessary to obtain
locally two 3
ft. 10 in. x 3 in. x 1 in. planed wooden battens and secure them
to the tapped
bosses on the back panel of the kiosk. The bottom of both
battens should be
about 2 ft. from the floor; suitable screws for fixing the
battens are supplied
with the kiosk. The equipment should be mounted on a Wallboard,
48 in. x 29.75 in. as shown on Diagram
EC1852. The completed
wallboard equipment should be
secured to the battens with six Screws for Wood of suitable
size, in such a
position that the bottom edge of the Bracket, Telephone, No. 12
is 4 ft. from
the floor. The battery of two or three Cells Leclanché, R40
(according to
requirements) should be housed in a Box, Battery, Leclanché,
WK4, 2-cell, C.O.
mounted on a Wallboard, 12 in. x 7 in. and secured to the back
panel of the
kiosk, as shown in Diagram EC 1852. The four holes for securing the
wallboard
should be drilled and tapped in Whitworth locally. The conduit
carrying the telephone leads should be fitted with a tee piece
behind this
wallboard to accommodate the battery lead. If considered
desirable, the method
described in C 5905 for fitting the coin box should be adopted.
30. Plan 2G
When a Plan 2G is installed in a kiosk, cabinet or recessed call
office, Drawing EC1851
should be followed, except that, due to the absence of a
coin-collecting box, it will be necessary to bridge the gap
between the two
containers on the Wallboard D2/60577. A Desk No. 19 is used for
this purpose,
and is fitted in the following manner:-
The desk is positioned with its top level with the upper face
of the
containers, and its back flush with the wallboard. It should be
secured (using the screws provided), first to the
side of the left-hand container and then to the underside of
the top of the
right-hand container.
The Block, Terminal, No. 20/4 required with this arrangement
should be fitted
in the back of the left-hand container; the slack of the Cord,
Instrument, No.
3/99BN, 26 in. should be pulled through into this container and
protected by the
Partition D60967.
Drawing EC1896
(1936) shows an earlier layout for a Plan 2G installation. In
this case a standard Wallboard was used with a Telephone No. 232 and
a Desk No. 15. This consists of two telephones in parallel
with a Bellset only fitted at the Attendants telephone position.
The Cabinet telephone is not fitted with a dial.
31. Subscribers' installations in magneto areas
The equipment should be
mounted on a Wallboard ... in. x ... in. The smallest size
consistent with the
necessary equipment being mounted neatly should be used. A desk
should not be
provided. The instructions regarding notices given in A 3006
should be followed.
32. Backboard No. 1
The backboard which is bolted to the coin-collecting box
is used to conceal the wiring taken into the back of the coin
box.
33. Preparation of wallboards at a central depot
Except in a Kiosk No. 6 (Mk.
2) it may be advantageous to mount the equipment on the
wallboard and carry out
wiring and testing at the local installation centre. Since a
fully equipped
lower wallboard for a public call office weighs approximately 65
lb. and is to
be fitted in a confined space, a procedure for fixing them in
position to suit
local conditions which would avoid danger of injury to the staff
must be
specified by the responsible supervising officer.
ADJUSTMENTS AND TESTS TO BE APPLIED
AFTER INSTALLATION
34. General
Accurate adjustment of the coin-box mechanism is essential for
efficient
operation and consequently the staff employed on this class of
work should be
familiar with this apparatus and this Instruction.
35. Minor repairs to apparatus
The apparatus should normally be received in good condition and
if minor adjustment or repair is necessary this may be done on
site; otherwise
the item should be changed for a good one and the defective item
suitably
labelled with a report of the fault should be returned to the
Supplies Dept. or
overhaul centre.
36. Coin-box tokens
Tokens, Coin-box, No. 4 may be used for testing the
coin-box mechanism. The serial number of each token deposited in
a coin box must
be recorded.
37. Use of 'temporary out of service' notice T431G
If for any reason it is
not possible to open a public call office for service
immediately after the
fitting work has been completed a notice
T431G should be
exhibited and should
be recovered when the installation is brought into service.
38. Postpayment coin-collecting box mechanisms
The functional tests to be
applied to confirm that the mechanism and telephone apparatus
are in a
satisfactory condition to put into service are detailed in TESTS
& INSPECTIONS, Routine, S5206. Any adjustment necessary as
a
result of these tests should be made in accordance with D5001.
39. Prepayment coin-collecting box mechanisms
These mechanisms will be received from the Supplies Department in a
partially-adjusted condition, i.e. the
balance weight and the spring-set associated with the balance
arm (Spring-set
No. 2, Diagram N1167) will require to be adjusted locally. The
adjustment to be
made will depend upon whether the mechanism is to work in an
automatic or a
manual exchange area, as follows:-
(a) Automatic area. The lever spring is required to 'break'
from the right-hand contact when the balance
arm is operated. The method of adjustment is detailed in D5001. Functional
tests which should be applied after adjustment of the spring-set
are described
in TESTS & INSPECTIONS, Routine, S5207.
(b) Manual area. The lever spring is required to 'make' with
the left-hand
contact when the balance arm is operated. The method of
adjustment is detailed
in D5001. Functional tests to be applied after adjustment of
the spring-set are
described in TESTS & INSPECTIONS, Routine, S5206.
40. Broken glass
Any broken glasses in public call offices should be
reported to the maintenance control and changed or made safe so
that injury to
members of the public is not possible.
Automatic systems are wired to diagram -
N2408.
Additional Pictures

Before installation of coin box and telephone equipment
Top section is a Wallboard D 1/60577 and the lower is a D 2/60577

Fully fitted out Jubilee interior
These are early containers and are marked "Parcels" and
"Directories".
The hook to the left of the Directories is for umbrellas.

Kiosk No. 6 layout using Box, Coin Collecting
No. 14
Diagram EC 2081 (1936)

Kiosk No. 6 Magneto layout using Box, Coin
Collecting No. 16B and Telephone No. 196
Diagram EC 1852 (1936)


Wallboard D63859
Introduced in the early 1940's and covers all exchange types except
Magneto.
Probably a Wartime expediency to save on resources.
Drawing EC1872 (1942)
Superseded by EC1851 in 1951 - see
below.

Kiosk Interior from 1951
Drawing - EC1851
|