TELEPHONE No. 37
Originally called the "Telephone, House, Wall, Intercommunication, Secret, 1 way" it was later renamed as the Telephone No. 37.

Used in conjunction with Telephone Nos. 39, 41 and 43.

Telephone includes (1928):-
1 x Hook for Micro telephone.
1 x Switch Selector.
1 x Bell, Trembler.
1 x Press Button.
1 x Vibrator.
1 x Coil Induction.
1 x Relay, Cut-in.
1 x Telephone No. 32.

The handset is a Telephone No. 32.

Circuit Diagrams - TL233 and N137.

Made obsolete in 1947.

Pictures dated 1907.

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Last revised: September 24, 2025

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