[time-nuts] The Pendulum Paradigm by Martin Beech, 2014
Tom Van Baak
tvb at LeapSecond.com
Wed Oct 28 13:03:11 EDT 2015
Yes, if you measure well enough, every mechanical clock reveals periodic variations from imperfections in its gears, the balance of the hands, changes in spring tension, and environmental changes such as temperature, humidity and air pressure. It shows up in spectral plots, in Allan deviation plots, as well as the time and rate plots. Some examples here:
Add earthquakes to the list of what a pendulum clock will detect:
Most people use this system to measure their pendulum clocks:
As for pendulum clocks and gravity, yes, the very best pendulum clocks in the world are stable enough to reveal the changes in the acceleration of gravity due to the periodic motions of our earth-sun-moon. For details see:
----- Original Message -----
From: "Peter Reilley" <preilley_454 at comcast.net>
To: <time-nuts at febo.com>
Sent: Wednesday, October 28, 2015 7:23 AM
Subject: Re: [time-nuts] The Pendulum Paradigm by Martin Beech, 2014
>I have been pondering pendulum clocks. I was wondering what the ADEV of a
> pendulum would show. I assume that you could see the errors in the
> gear train.
> You should see the period of each gear. You should see the spring wind
> and being rewound.
> Further, would you be able to see the phase of the moon and the tides?
> is using the pendulum as a gravimeter. Would it be sensitive enough
> for that?
> (have to stop my mind from wandering.)
> On 9/19/2015 7:15 PM, Brooke Clarke wrote:
>> I just started reading the subject book where the mathematics of the
>> pendulum are used as a unifying idea to tour physics.
>> Included is a correct illustration on page 205 of Foucault's gyroscope
>> demonstration that the earth turns 360 degrees in a sidereal day.
>> Maybe there will be a reference to a gyroscope as a pendulum that's
>> making full circles rather than swinging back and forth.
>> Mail_Attachment --
>> Have Fun,
>> Brooke Clarke
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