Wooden cased Bellset used with Telephone No. 4 on CBS No 1, Plan 1 systems (1 simple extension).

Used with Telephone, No. 4.

Bellset includes (1928):-
1 x Bell, No. 13A minus base, or 1 x Bell No. 56A.
1 x Coil, Induction, No. 1 or No. 12

Mark 235 has a Bell, No. 56A fitted internally with the bell gong positioned outside of the casing.

Made obsolete in 1947.

Circuit diagram - N 506.


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Last revised: January 27, 2020