> In the evolution of timekeepers the SHORTT CLOCK was one of the great  
> milestones.
...
> These clock kept very good time.
> Cheers, Neville Michie

Yes, stability at 1 day was right around 1e-8 for a Shortt.

Stability (ADEV) of one Shortt pendulum clock:
http://www.leapsecond.com/museum/shortt/

For more details on Shortt and ADEV see:
http://www.leapsecond.com/hsn2006/ch2.pdf

/tvb


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