[time-nuts] Caveats on Allan Deviation with ultra stable oscillators

Hal Murray hmurray at megapathdsl.net
Sat May 31 02:43:31 EDT 2014


> Always locate your DUTs physically orthogonal to each other. 

Unless you have 3 clocks.  (and everybody knows what happens if you only have 
2)

>From an old time-nuts message (Mar, 2009)

> Allied to this discussion is the Loomis effect, discovered by the
> American millionaire who had three Shortt clocks running in his
> basement. They synchronised unless aligned at 120 degrees to each
> other. I wonder weather they were shaking the bedrock, or maybe the
> gravitational attraction between the 10 kg pendulums may have
> synchronised them.   (See "Tuxedo Park" by Jennet Conant) He qualified
> as the first time nut. 

It's on page 67-68.

Google for >Tuxedo-Park Shortt< gets a hit in books.google.com at page 65 
which is the start of the coverage of Shortt clocks.  That was long before 
eBay.  :)




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