BELL No. 56

DC bell with a 2.5 inch gong (Gong-Bell No. 2).

Operating voltages and resistances:-
Bell 56A - (2 x 50 ohm coils) - 2-5 or 5-10 volts DC
Bell 56B - (2 x 250 ohm coils)
Bell 56C - (2 x 1000 ohm coils) - 10-25 or 25-60 volts DC
Bell 56D - (2 x 50 ohm coils) - 2-5 or 5-10 volts DC  - includes Bobbin Resistance 2k ohms.
Bell 56E - (2 x 250 ohm coils) - with permanently wired FR Interference suppression and Resistor Carbon 2.2k ohms.

Internal use only.

Diagram N656.

Coloured black these bells were universally used throughout BT and many private companies.  Early versions may have a wooden base (see picture below) or metal cover.  Most will be made out of plastic.

Superseded Bell No. 13.


Bell No. 56C with a wooden base
(Picture dated 1932)


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Last revised: March 31, 2020