TELEPHONE No. 31
Originally called the "Telephone, House, Wall, 4-Terminal" it was later renamed as the Telephone No. 31.

It was a house telephone with Trembler bell (DC) and a single press button.

Used in connection with up to four other Telephone No. 31's and a Telephone No. 33 or 35 to make a 5 or 10 extension house system.

The press button calls the main telephone only.

Uses a Telephone No. 30 as the handset.

The rosette has 4 terminals.

Details otherwise as for Telephone No. 29.

Telephone includes:-
1 x Bell, Trembler.
1 x Hook for microtelephone..
1 x Press-button.
1 x Telephone No. 30.

Made obsolete in 1937.

Circuit Diagram - N131.

System wiring diagram - N133.

Information on all House telephone systems

 


 
 
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Last revised: September 24, 2025

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