TELEPHONE No. 10
C.B. Candlestick with press button fitted in the base. The button was made of ebonite.
This telephone can be have an additional receiver hook fitted. This was ordered separately and for the Mark 235 was the Hook, Receiver D.
There was a Mark 234 and a Mark 235. The Mark 234 was the golf ball type and the Mark 235 was similar to the standard GPO style candlestick - Telephone No. 2.Telephone includes (1928):-
1 x Receiver, Bell No. 1A.
1 x Cord, Instrument No. 2/22B Brown 33".
1 x Transmitter No. 1.
1 x Transmitter-inset No. 3.
2 x Cord, Instrument No. 1/16F Black 12".
Telephone includes (1946):-
Introduced circa 1907 and still in the GPO stores catalogue (Rate Book) in 1928 and 1946.
The picture to the right shows an earlier variant, later variants looked like the standard British candlestick (see picture below).
The press button was used to call a buzzer on another phone to advise there was a call for them.
The switch hook contact springs consisted of three contacts that made contact with each other on operation.
The early type used a Transmitter No. 1 which could have Label No. 43 fitted between the speaking tube and the transmitter body. This label advised of the Exchange name and number. See picture below.
A Hook, Receiver D could be retrofitted to the Mark 235, for use with a Watch Receiver.
Circuit diagram - N110.
Drawing No. 7026 (Mark 235 dated 1911).
Specification - D194.
Last revised: August 23, 2021