TELEPHONE No. 4
LB Pedestal Telephone
CBS No. 1 - Table telephone if used with Bellset No. 5.
The Transmitter No. 2 would have Label No. 78
fitted between the speaking tube and the transmitter body. This label
advised of the Exchange name and number.
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.
There are a number of revisions to this telephone (Marks 234 to 236). The Mark 236 is fitted with a Transmitter No. 22.
Early table telephones were connected to the internal wiring with a Strip, Flexible Cord Connection. Click here for more information.
Telephone includes (1928):-
To be requisitioned separately if required:-
Telephone includes (1946):-
Circuit diagram - N104.
Diagram - CBS 265 (CBS 1 and Magneto - Non condensered).
Drawings - 10015, 9544 & 62901 (Mark 235 dated 1911).
Specification - D202.
Made obsolete in 1947 and superseded by Telephone No. 156LB.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.
Telephone No. 4 Mark 236
Last revised: December 13, 2022