[time-nuts] gravity controlled pendulumn clock?

Bob Camp lists at rtty.us
Mon Dec 12 17:47:10 EST 2011


Hi

If you have a mountain nearby, it does indeed impact the local field. I believe they first measured that in the 1700's.  

Bob

On Dec 12, 2011, at 5:19 PM, Magnus Danielson 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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