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.

Used in Magneto and CBS exchange areas.

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 only has one receiver fitted, but another can be fitted, if required, on the right hand side of the case 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 was always 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.

Telephone includes:-
1 x Coil, Inductor No. 1.
1 x Relay.
1 x Cord, Flexible No. 222.
1 x Receiver, Bell No. 2.
1 x Arm, Switch, Bell, Receiver.
1 x Transmitter No. 3 (Deckert).

To be requisitioned separately as required:-
1 x Cord, Flexible No. 222.
1 x Receiver, Bell No. 2.
1 x Arm, Bell, Receiver or Arm, Switch, Bell, Receiver.

Superseded by the Telephone No. 21.

Circuit diagram - N117.

Telephone No. 17 fitted with an additional Receiver

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Last revised: February 01, 2023