[time-nuts] gravity controlled pendulumn clock?

Azelio Boriani azelio.boriani at screen.it
Mon Dec 12 17:53:27 EST 2011


Aha, there is a near-field for gravity too? Interesting... going to google
for gravitational near-field at once!

On Mon, Dec 12, 2011 at 11:19 PM, Magnus Danielson <
magnus at rubidium.dyndns.org> wrote:

> On 12/12/2011 01:37 AM, Jim Lux wrote:
>
>> On 12/11/11 4:04 PM, Tom Van Baak wrote:
>>
>>  GCPC -- gravity controlled pendulum clock (elevation)
>>>
>>>
>>
>> intriguing. From your parenthetical remark, I'm assuming you move the
>> whole assembly up and down to adjust the speed?
>>
>> I was thinking about a huge mass that moves around?
>>
>> let's see.. period is proportional to sqrt(1/g)
>>
>> g is proportional to 1/r^2, so period is proportional to r.
>>
>> Earth is roughly 7000 km radius, so moving it 1 meter higher or lower
>> changes the period by 1part in 7million... interesting.
>>
>
> Hmm... how does the near-field gravitational pull behave?
>
> The far-field is surely r^-2, but wonder about the near-field effect.
>
> Need to grab some paper and pen and convince myself.
>
> Cheers,
> Magnus
>
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