TELEPHONE No. 251

Local Battery (LB) wooden wall telephone used in Automatic, Magneto and CBS No's 1, 2 & 3 exchange areas on long lines.  It has a Telephone No. 164 as a handset.

It was supplied with a dummy dial, which would be replaced by a dial if used in Automatic exchange areas.

These telephones were generally a GPO factory refurbished  Telephone No. 151 with the fixed transmitter and Bell receiver removed.  In their place was fitted a Telephone No. 164.  

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.

Available in the colour black only.

There was a Mark 1 and Mark 2, the only difference being the handset.  The Mark 1 used the Telephone No. 164 (Mark 1) whilst the Mark 2 used a Telephone No. 164 (Mark 2).

This telephone requires batteries to power the transmitter (would have been two Cells, Dry Y, making a total voltage of 3volts).

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

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