[time-nuts] Three subjects.

[JayHolovacs]

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 
improve timekeeping.



Hal Murray wrote:

>>http://www.telechron.com/
>>    
>>
>
>Neat.  Thanks.
>
>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?
>
>
>  
>