Quote:
Originally Posted by rambo1152
...according to the legend printed on the cover, when it was "off" the switch contacts were closed.
Was that the normal way of muting a 300 series bell? I can't remember seeing a similar switch used anywhere else.
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Yes, the way to disable a series bell was to short it out, as the circuit to any other bells needed to be maintained. Maybe what was unusual about yours was the use of a switch repurposed from non-telephone use that was marked "on" and "off". When converting old telephones with internal bell on/off switches from serial to parallel, it has been my experience that I have had to swap the open-when-on and the closed-when-on wires. Foruntately, they always seem to have been made as two-way switches.