> Does anybody have any ADEV data for mechanical clocks? (I didn't find any by
> google, but there was a lot of noise so maybe I missed something.)
It's often buried in out-of-print horological books or magazines / journals /
articles that google may or may not index.
I have some ADEV examples here:
http://www.leapsecond.com/pages/m21/ -- the classic Navy chronometer
http://www.leapsecond.com/pend/shortt/ -- see Stable32 / Timelab plots
http://www.leapsecond.com/pend/clockb/ -- go to technical links
http://www.leapsecond.com/hsn2006/ -- see dream pendulum paper
> I'd expect a watch to slow down slightly as the spring unwinds. That
> probably doesn't apply to clocks driven by weights.
Clockmakers are clever and implement methods to keep constant power:
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