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
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to
https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
_______________________________________________
time-nuts mailing list -- [email protected]
To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
and follow the instructions there.
