[time-nuts] gravity controlled pendulumn clock?
azelio.boriani at screen.it
Mon Dec 12 22:53:27 UTC 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.
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