Wall mounted wooden dial telephone, used on extension plans in Automatic exchange areas.  Many are found on backboards with a writing shelf called a Desk No. 4.

Similar to the Telephone No. 77 except for the capacitor wire had been repositioned and the Telephone fitted with Dial, Automatic No. 8.

This telephone superseded the Telephone No. 55.

This telephone was superseded by the Telephone No. 121.

Telephone includes (1928):-
1 x Bell No. 1A, unmounted, with bias spring.
1 x Coil, Induction No. 14.
1 x Condenser, M.C. No. 30.
2 x Cords, Instrument No. 116.
1 x Cord, Instrument No. 222, waterproof.
1 x Dial, Automatic No. 8FA.
1 x Hook, Receiver F.
1 x Mounting, Dial, Automatic No. 7.
1 x Switch, Receiver No. 2.
1 x Transmitter No. 1.
1 x Receiver, Bell No. 1A.

A Desk No. 4 would have been requisitioned separately when required.

Circuit diagram - N205.

Circuit diagram - A.T. 753.

The picture is dated 1925.

Click here for more information on Bias Springs.



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Last revised: October 17, 2023