[time-nuts] The Pendulum Paradigm by Martin Beech, 2014

Azelio Boriani 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
challenge.

<http://leapsecond.com/hsn2006/pendulum-tides-ch5.pdf>

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
>>> down
>>> and being rewound.
>>>
>>> Further, would you be able to see the phase of the moon and the tides?
>>> This
>>> 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
>
>
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