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AC/HL · 11th Jun 2012, 3:18 pm

I would guess that it would have used one or two "Flag" cells (1.5V) in a separate wooden case. The main requirement is to be able to ring the bell, so you need to find the minimum voltage for this by experiment.
A close up of the circuit diagram might help.

11th Jun 2012, 3:18 pm	#6
AC/HL Dekatron Join Date: Nov 2003 Location: Heckmondwike, West Yorkshire, UK. Posts: 9,642	Re: 1920s Direct line telephone/intercom I would guess that it would have used one or two "Flag" cells (1.5V) in a separate wooden case. The main requirement is to be able to ring the bell, so you need to find the minimum voltage for this by experiment. A close up of the circuit diagram might help.