BELLSET No. 4


Wooden Bellset with four position switch used on C.B. systems.

Introduced in 1909 and used on circuits with one exchange line and one extension giving intercommunication with or without secrecy.

Used on extension plans 5 & 7.

Superseded by Bellset No. 20.

Bellset includes (1928):-
1 x Bell No. 1A unmounted (with Bell gongs No. 17).
1 x Condenser, M.C., No. 14.
1 x Generator No. 4C.
1 x Indicator and key, No.1 (for mark 234) or No. 4 (for mark 235).
2 x Bell-gong No. 17.

Diagrams
Circuit diagram - N504.
Mark 234 - C.B. 607 and 608.
Mark 235 - C.B. 877 and 608.



 

 
 
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Last revised: February 12, 2021

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