Where does the relaxation time of ~ 1 hr arise??
Don
On 2018-12-01 06:17, Tom Van Baak wrote:
Surely, this is nothing new?
Once or twice a year some national lab, often NIST, makes an
announcement of a new level of precision for their atomic clocks. It's
pretty cool, actually. It's good PR. The rate of progress is amazing.
I thought standard pendulum clocks were quite good at detecting
gravity as well!
Yes and no. Modern uses for precision gravity measurement often
require precise data while flying or in orbit. Pendulum clocks don't
do well in those conditions.
They make excellent earth-quake detectors - Randall Peters published
many excellent papers on this subject many years ago, fascinating
stuff.
Yes. For example, see the pendulum results of yesterday's earthquake:
http://leapsecond.com/pend/synchronome/quake.htm
John Moran
/tvb
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--
Dr. Don Latham AJ7LL
PO Box 404, Frenchtown, MT, 59834
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