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.

These telephones were generally a BPO factory refurbished Telephone No. 151 with the fixed transmitter removed and a Telephone No. 164 fitted as the handset..  

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 between them was the handset, with the Mark 1 having Telephone No. 164 (Mark 1) whilst the Mark 2 had a Telephone No. 164 (Mark 2).

This telephone requires batteries to power the transmitter.

Telephone includes (Rate Book 1946 and 1956):-
1 x Bell No. 1A, Unmounted.
1 x Dial, Automatic, Dummy No. 4.
1 x Bell-gong No.2, Oxidized.
1 x Bell-gong No.2A, Oxidized.
1 x Hook, Receiver AB.
1 x Mounting, Dial, Automatic No. 7.
1 x Capacitor, M.C. No. 97.
1 x Switch, Receiver No. 4.
1 x Coil, Induction No. 21.
1 x Telephone No. 164, Black.

To be requisitioned separately as required:-
1 x Cord, Instrument No. 5/28E, 5" (Auto systems).
1 x Dial, Automatic, S.S. No. 10 (Auto systems).
1 x Generator, No. 26AN (Magneto systems).
1 x Label No. 160 ...

Circuit Diagram - N351.

Drawing - 63038.

Adjustment of Magneto bells

Collectors Information - what to look for


 
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Last revised: December 26, 2021

FM