[time-nuts] Detecting gravity with optical atomic clocks

[Didier Juges]

Tom,
I suspect something so sensitive gives you significant "false positives"
when a delivery truck goes by. I assume you try to correlate your data with
other enthusiasts nearby to resolve those discrepancies the way we do with
our clocks?

Didier

On Sat, Dec 1, 2018, 7:44 AM Paul Bicknell <paul at bicknells.f2s.com wrote:

> 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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