TELEPHONE No. 75
mounted telephone used on CBS
No. 2 & 3 systems.
Made for external use at cab ranks etc.
Cast Iron case with lockable door and electro-magnetic catch, which unlocks the door on ringing.
The phone goes off hook, by the use of a spring plunger switch, which is operated when the door is opened. Simple speech circuit with the receiver and transmitter in series.
Similar to Telephone No. 59 except that it had no magneto.
Introduced circa 1917.
Superseded by Telephone No. 125.
Circuit diagram - N175.
Diagram CD 943.
Last revised: August 22, 2021