In article , Robert Swinney says...
... I recall
reading that early watt-hour meters were electrolytic devices. Not sure how
they worked, though. Maybe someone can help.

Ah, now *that* was edison, of course. He could not make any
kind of watt-hour meter that depended on any AC effects of course.
So he invented and used the electrolytic type. They had to
be kept from freezing incidently.

Jim


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