Chronology Current Month Current Thread Current Date
[Year List] [Month List (current year)] [Date Index] [Thread Index] [Thread Prev] [Thread Next] [Date Prev] [Date Next]

Re: [Phys-l] Queston: simple pendulum lengthen suspension.



At 01:17 PM 3/19/2007, you wrote:

About the turn of the century. Horologists designed rather period
constant pendula clocks. Very high Q (well over an hour for A to
decrease to 1/e), minimal interference w/ the period by the addition and
extraction of energy. [Gravity impulse at 30 s interval and at that
time stepping the clock -- master and slave(s) w/ the master in < one mm
Hg vacuum etc.]


This description of the master/slave arrangement differs from the one
I used to study as a kid in the clock-maker's shopfront window.
There [if I remember correctly] the slave was provided with a gravity
impulse if the amplitude dropped sufficiently to allow a detent to engage an
electrical contactor which happened about every thirty seconds??



Brian Whatcott Altus OK Eureka!