TELEPHONE No. 92

Portable field telephone for use on Magneto, CBS and C.B. exchanges.

This telephone was assembled at the GPO Factory in Holloway, London.

There were three versions:-
Telephone No. 92 Mk 234
Fitted with Transmitter No. 2 and Bell receiver.

Telephone No. 92 Mk 235 (see picture)
Fitted with Transmitter No. 3 and Watch receiver.

Telephone No. 92A
As per the Mk 235 except the circuit is modified to allow the telephone to be used on C.B. exchanges.

Circuit diagram - N192.

All the pictures were taken in 1915 and show the Telephone No. 92A (Mark 235).

Also known as a Trench Telephone.
 

Last revised: July 22, 2025