TELEPHONE No. 1

Standard GPO wall telephone for use in C.B. exchange areas. It was originally called the "Telephone, Wall, C.B. 3 terminal" and later the "Telephone, Wall, C.B. 5 terminal". When the GPO moved to a numbering scheme for telephones it then became the No. 1. The Mark 234 superseded the 3 and 5 terminal models.

Made by British Western Electric (originally their Model No. 265) and used by the National Telephone Company (their Telephone No. 4). The GPO inherited the NTC's telephone estate and therefore a large number of NTC Telephone No. 4's.

This is a wooden cased telephone fitted with a sloping writing desk and fitted with a Bell Receiver, 1000 ohm bell ringer, Induction Coil and solid back transmitter.

The 3 terminal type was superseded by the 5 terminal type.

A later style, the Mark 234, was introduced around 1917 (see picture to the right) and these were fitted with a detachable switch hook, the Hook, Receiver F. The top of the telephone was square and not ornate like previous models.

A coin collecting box can be connected to this telephone.

The telephone should be fixed to the wall, the lower edge 40 inches from the floor.

This telephone superseded the Instrument, Subscribers, Wall N.T. No. 13.

This telephone was in the 1928 Rate book but not available in the 1946 Rate Book.

Telephone Mark 234 includes (1928):-
1 x Receiver, Bell No. 1A (60ohms).
1 x Bell No. 1A, Unmounted.
1 x Coil, Induction No. 4.
1 x Capacitor, M.C. No.3.
1 x Cord, Flexible 2/22B, Brown, 33".
1 x Arm, Transmitter No. 1.
1 x Frames, Notice No. 1.
1 x Glass No. 3.
1 x Hook, Receiver F.
1 x Transmitter No. 1.
2 x Cord, Flexible 1/16E, Black, 12".
1 x Label No. 43.

Mark N.T. No.13:-
1 x Coil, Induction No.3.
1 x Condenser, M.C. No. 6.

Mark N.T. Nos. 14 and 16:-
1 x Coil, Induction No.3.
1 x Condenser, M.C. No. 2.

Additional Information
Early Type - 3 Terminal (Type 2607):-
1 x Coil, Induction No. 4.
1 x Bell No. 11A.
1 x Condenser M.C. No. 2.

Later Type - 5 Terminal:-
1 x Induction, Coil, No. 4.
1 x Bell No. 1A, Unmounted.
1 x Condenser MC No. 3.
1 x Hook, Receiver F.

Early Telephone No.1's were in fact NTC badged. NTC bought the phones from British Western Electric who made them in Antwerp, Belgium. The B.P.O continued to purchase from the British Western Electric Co. and this was their model No. 312.

Some may have been made by British Ericsson, their mode N1460.

Superseded by the Telephone No. 101.

Circuit diagrams - N101 and C.B. 518.

A discussion on the Telephone No. 1

How to convert to Plug and Socket

Labels for the notice frame