Re: 1920s Direct line telephone/intercom
Ooh - I've got a pair of those. They were in my grandparents house in London when they moved in (1940s). The previous owner was a doctor, and the phone was used for his secretary to let him know a client was waiting. I had them working when I was about 14, but haven't tried since. Mine don't have the labels on the terminals though, which made it more difficult!
I seem to think I had a 1.5V battery at each end, but can't be sure.
Rich.
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