TELEPHONE No. 17
Telephone No. 17 mounted on a backboard with bellset
Wooden wall telephone with Deckert transmitter and press button (on top of case), similar to the Telephone No. 19.
Also known as the Post Office telephone for Granular Transmitter 'A' (GTA).
The Telephone No. 17 has one switch hook and one receiver, which are positioned on the left. The above picture shows a Telephone No. 17 which has an additional receiver fitted, if required, but the hook in this case is fixed.
Similar in construction to the Telephone No. 21, this phone has different gravity switch contact arrangements.
There is no bell in the telephone so a Bellset must be provided.
Note the oval brass number plate. Each bell and telephone carried its inventory number. Around 1907 the Post Office realised that numbering each telephone was too much effort for too little usefulness and stopped the practice.
Superseded by the Telephone No. 21.
Circuit diagram - N117.
Telephone No. 17 fitted with an additional Receiver
Last revised: November 12, 2021