Re: 1920s Direct line telephone/intercom
I dug my one house phone out last night. Externally it is identical to the ones in the photo, but it is much simpler internally. It doesn't have a coil, and the mic and earpiece are simply connected in series.
It has three terminals, L, BL and BT.
Both bell coils are labelled 2 ohms, and over 2 volts is required to ring it, so 2 or 3 flag or Leclanche cells would seem to be the right supply.
According to the label it was manufactured by the Phoenix Telephone & Electric Works.
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