[time-nuts] Pendulums & Atomic Clocks & Gravity
Mike S
mikes at flatsurface.com
Sun May 27 01:03:51 UTC 2007
At 07:49 PM 5/26/2007, Brooke Clarke wrote...
>Back in the 1800s clock makers found ways to temperature compensate
>the
>pendulum such as putting a Mercury thermometer at the bottom, using
>metals with
>dissimilar expansion coefficients (Harrison used steel and bronze (no
>zinc
>then)) or materials with almost zero COE like Invar.
>
>The Dent clock at Greenwich in 1885 had an arenoid type compensator to
>remove
>barometric pressure effects, later clocks were run in vacuum.
Does your clock (you only stated you were adjusting the bob on a
pendulum clock) have either feature? The vast majority, I would hazard
to say, don't.
More information about the Time-nuts_lists.febo.com
mailing list