TELEPHONE No. 4
around 1911, this Local
telephone, with no dial aperture, was used on CBS and
It was used in conjunction with a Generator No. 4CN.
CBS No. 1 table telephone if used with Bellset No. 5.
This was the standard telephone instrument arranged for standing upon a table. Since this telephone is simply a transmitter, a receiver, and a gravity switch, the instrument is not complete, and a separate hand generator is provided, usually fixed to the desk or table in close proximity to the table telephone; the induction coil and magneto bell, with the condenser (should one be required), are fitted in a case and are known as a Bell Set.
The bell set for use with the telephone is Bell Set No. 5, if the condenser is not necessary, and Bell Set No. 15 if a condenser is required. The bell set need not be fitted close to the telephone so long as it is within audible distance of it. The primary battery is placed in a battery box and fitted close to the bell set to which it is connected.
The Gravity switch is a new design where the contact springs are operated by an Ebonite rod. This ensures that the receiver hook is insulated from the line, in case of a high voltage contact between external overhead cables.
Telephone includes (1928):-
To be requisitioned separately if required:-
Telephone includes (1946):-
Circuit diagram - N104.
Diagram CBS 265 (CBS 1 and Magneto - Non condensered)
Diagram Nos. 9544 & 62901 (Mark 235 dated 1911).
Made obsolete in 1947 and superseded by Telephone No. 156LB.
When fitted with a Transmitter No. 2 the Exchange Number label is a Label No. 78.
Last revised: February 12, 2021