[time-nuts] The Pendulum Paradigm by Martin Beech, 2014
azelio.boriani at gmail.com
Thu Oct 29 09:25:40 EDT 2015
Yes, but first you need a very stable pendulum clock as pointed out by
TVB, a stability better than 0.05ppm for a mechanical clock is a real
On Thu, Oct 29, 2015 at 12:56 PM, Jim Lux <jimlux at earthlink.net> wrote:
> On 10/28/15 7:48 PM, Jim Lux wrote:
>> On 10/28/15 7:23 AM, Peter Reilley wrote:
>>> 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?
>> yes.. it's in the sub-ppm range, as I recall.
>> Period goes as sqrt(L/g)
>> from wikipedia
>> lunar tidal acceleration at the Earth's surface along the Moon-Earth
>> axis is about 1.1 × 10−7 g, while the solar tidal acceleration at the
>> Earth's surface along the Sun-Earth axis is about 0.52 × 10−7 g
>> So sqrt(1/(1+1E-7))... about 0.05 ppm
> so you'd need an ADEV <1E-9 at a tau of 12 hours
>> time-nuts mailing list -- time-nuts at febo.com
>> To unsubscribe, go to
>> and follow the instructions there.
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> and follow the instructions there.
More information about the time-nuts