In article ,
>> [TELECOM Digest Editor's Note: City of Chicago used DC power (rather
>> than AC) -- at least in the downtown area -- until sometime around
>> 1930. That's at least one reason why there were so many WUTCO clocks
>> everywhere, instead of 'regular' wall clocks. Clocks cannot run on
>> direct current; they require alternating current at 60 cycles.
> I wonder what they did in territory where the generated A.C. power was > at 25 cycles.
When did they deliver AC at 25 cycles? I do recall some 50 cycle companies around that had to change after the end of WWII.