TELEPHONE No. 251
Wooden wall telephone used in Automatic, Magneto and CBS No's 1, 2 & 3 areas on long lines. It was supplied as a Local Battery telephone and modified as required. It has a Telephone No. 164 as a handset.
Generally a BPO factory refurbished Telephone No. 151 with the fixed transmitter removed.
Introduced in 1944 this set was specifically for long lines and it is thought that it was for use in areas that had sustained war damage to the local exchange.
There was a Mark 1 and Mark 2. The difference was that the Mark 1 had a Telephone No. 164 (Mk 1) whilst the Mark 2 had a Telephone No. 164 (Mk 2).
Telephone includes (1946 and 1956):-
To be requisitioned separately as required:
Circuit Diagram No. N351.
Drawing No. 63038.
Last revised: November 29, 2020