[time-nuts] Three subjects.
jayh6 at verizon.net
Thu Jan 5 06:42:57 EST 2006
Yes, there were a similar product produced for schools and offices that
synchronized the clocks to a master kept in the office though it lacked
the function for bringing a generator output into line.
For a time, before quartz, the very best observatory clocks were a
pendulum variety with a 'master' pendulum in a vacuum case and a 'slave'
pendulum in a conventional clock. The slave was set very slightly slower
and pulled into line from a periodic pulse from the master (which was
kept running with electrical impulses). I would guess that there was a
Amateur Scientist article covering something like this, though with the
refinement of pendulum longcase (grandfather) clocks by that time in
history, I don't know as any amateur modifications would actually
Hal Murray wrote:
>I think we had one like that back in grade school. That was a long time ago.
>There was an article in Scientific American 20 or 30 years ago. The idea was
>to make an old grandfather clock keep very good time by adding a magnet to
>the pendulum so you could gently push/pull it.
>Anybody remember that one? Anybody build one?
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