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. _______________________________________________ time-nuts mailing list time-nuts@febo.com https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts