Something like that was also vailable in Switzerland -- the Mecca of the
watches -- and they called VIBROGRAPH, here more about it:
https://www.google.com/search?q=Vibrograph&client=firefox-a&hs=gzM&rls=org.mozilla:en-US:official&channel=np&tbm=isch&tbo=u&source=univ&sa=X&ei=mWb5Uo2GL8jQ2AWm0oCQAw&ved=0CCkQsAQ&biw=1056&bih=516
greetings
73
KJ6UHN
Alex
On 2/10/2014 2:37 PM, Tom Van Baak (lab) wrote:
Tim,
Perhaps a watchmaster G47? Very clever device, and yes, a fine mechanical
example of a phase comparator. Google for it and see sites like:
http://myplace.frontier.com/~dritland/watchmaster/
/tvb (i5s)
On Feb 10, 2014, at 12:01 PM, Tim Shoppa <tsho...@gmail.com> wrote:
IIRC some watch or clock company had a patent on calibrating a wristwatch
crystal against AC hum. I read it once but can't find it now. Can you hunt for
it?
Tom - when I was a kid in the 1970's, before digital watches, the local jeweler had
device with a table on which a watch or clock could be placed, the table must've been a
microphone, and it had a pen recorder. It produced a chart that looks like the
"phase data" charts on yours and other websites; the jeweler adjusted the clock
so the recorded line had no slope. It had a selector for several common watch/clock gear
ratios (don't think it did the tuning fork watches like the Accutron; I think there was a
similar but different device for checking the tuning fork Accutrons, my dad was enough of
a clock nut that he actually had a tuning fork Accutron, and he is a NAWCC member
still!). Over the course of an hour the adjustment could be fine trimmed to the point
where we knew the movement was good to a few minutes a month. Don't know if it was locked
to mains frequency or had a crystal. Do you know what this was called?
Tim N3QE
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