Australian Post Office
Telephone No. 1040

This is a magneto telephone imported from the USA in 1948 to cover an shortage of telephones at the time. It was used with a boxed magneto Kellogg Type 1205.

APO
Telephone Engineering Instructions
Substation
E 2003
Issue 1, April 1948

MAGNETO TELEPHONE, KELLOGG TYPE 1040 - SERIAL 1, ITEM 139
GENERATOR BOX, KELLOGG TYPE 1205 - SERIAL 1, ITEM 140
MANUFACTURED BY KELLOGG SWITCHBOARD AND SUPPLY COMPANY USA

1. INTRODUCTION
1.1 A limited. quantity of the above mentioned instruments has been purchased by this Department to provide relief in magneto areas during a period of acute shortage of telephones.

2. GENERAL DESCRIPTION
2.1 The complete working unit comprises a table telephone, Kellogg type 1040 and a generator box Kellogg type 1025 which includes a 5 bar generator. Each should be requisitioned separately under the serial items given above.

2.2 The picture in the Components section of this instruction gives a view of the base plate of the telephone with the components attached and shows the positions of the terminals and connecting Links. A notable feature or the assembly is the ease with which the component parts may be detached from the base plate without disturbing permanent wiring. This is achieved by the use of an interconnecting block wired underneath in busbar form and fitted with sockets for plug-in connections. A view showing the component parts detached from the base plate is given at the end of this instruction.

3. CIRCUIT DIAGRAMS
3.1 A circuit diagram is supplied by the manufacturer and pasted inside the lid of the generator box. A diagram using the Department's standard symbols and method of presentation is shown on Drawing C.E.474 which is reproduced at the bottom of this instruction. Arrangements are being made for a suitable diagram to be made available for replacement purposes.

4. EXTERNAL CONNECTIONS
4.1 The Kellogg table telephone is fitted with a four conductor cord and terminal block for connection to line via the generator box. The generator box is equipped with six terminals to which the incoming line, battery and telephone are to be connected. The connections between the generator box and the telephone may be made in permanent wiring to the terminal block associated with the line cord from the telephone or, alternatively, the terminal block may be omitted and the cord connected directly to the screw terminals in the generator box.

4.2 Standard battery equipment using two 1.5 volt dry cells should be used connected to the appropriate terminals in the generator box.

5. COMPONENT PARTS AND SERVICE ADJUSTMENTS
5.1 The induction coil is of the closed core type with 3 inductive windings and one non-inductive winding. The unit is enclosed in a moulded case and sealed with compound. Connection is made by means of 7 pins on the induction coil case, which plug into corresponding sockets on the connecting block.

5.2 Condensers are provided in the bell circuit and the anti-sidetone network as shown below. The condensers are encased in a single moulding which carries 5 connecting pins for plugging into the connecting block.

5.3 The moulded plastic handset is fitted with capsule type transmitter and receiver insets.

5.4 The magneto bell coils have a total D.C. resistance of 2500 ohms. The adjustment of the armature travel on the bell movement is made by means of a differential screw secured by a locknut which is located between the bell gongs. The gongs are adjusted in the same manner as for a standard bell type 59U.

6. PARTY LINE SERVICES
6.1 In view of the relatively high impedance of the bell, the use of the Kellogg telephone type 1040 on party lines should be avoided where possible unless all parties on the same line are equipped with instruments bells with similar characteristics.

7. REPLACEMENT PARTS
7.1 It is not proposed to provide special replacement parts for the Kellogg instrument end the following arrangements should be made when replacements are necessary.

7.2 Standard equipment is to be used whore practicable. For instance standard 4-conductor line cords and 3-conductor handset cords can be fitted. If a transmitter or receiver capsule is defective the complete handset is to be changed for e standard handset No. 184 and the Kellogg handset should be forwarded to the repair centre and held in a pool for use on other telephones or the same type. In cases where replacements cannot be made readily in the field the defective telephone should be forwarded to the repair centre to be reconditioned.  If repairs should prove impracticable the instrument should be held in reserve for supply of serviceable component parts to other instruments of the same type.

Last revised November 23, 2024

FM2