>> called a synchroscope displays the phase relationship between the grid=20
>> and
>> the generator. The 'scope looks something like a clock with a single=20
>> hand.
>
> Is this a mechanical device.  How does it use the two generator
> sources to drive such a scope.
>
> I guess a CRO on XY may be useful but what you describe does not
> appear to be a CRO.

The traditional synchroscope is electro-mechanical in nature. I am not sure=
=20
how it is physically implemented, although I expect it might involve two=20
synchros (or selsyns) or something like them coupled together. See=20
http://en.wikipedia.org/wiki/Selsyn

See also: http://en.wikipedia.org/wiki/Synchroscope

-- Bob Ammerman

--=20
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