[time-nuts] gravity controlled pendulumn clock?
jimlux at earthlink.net
Sun Dec 11 19:37:51 EST 2011
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.
Much more practical than my first though of mass.. 1 ton a meter way is
about 1.2E11 smaller than the effect of the Earth's mass
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