[time-nuts] Detecting gravity with optical atomic clocks

[Paul Bicknell]

Hi John 

Any chance of a picture of your Synchronome pendulum clock and associated
timing / logging equipment 

Paul B

-----Original Message-----
From: time-nuts [mailto:time-nuts-bounces at lists.febo.com] On Behalf Of Tom
Van Baak
Sent: 01 December 2018 13:18
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Detecting gravity with optical atomic clocks

> 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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