TELEPHONE No. 29
mounted house telephone with
handset, press button switch and trembler bell (DC) all mounted on a wooden
Fitted in pairs and used in lieu of a speaking tube between two rooms only.
Uses a Telephone No. 30 as the handset.
Made obsolete in 1947.
Telephone includes (1928):-
Circuit Diagram - TL 230.
Circuit Diagram - N129.
Last revised: November 21, 2021