Tim Attwood schrieb:

> It'd be fun to build a clock that ran off a gyroscope measuring the
> movement of the earth.

"It was Foucault who gave the device its modern name, in an experiment 
to see (Greek skopeein, to see) the Earth's rotation (Greek gyros, 
circle or rotation), although the experiment was unsuccessful due to 
friction, which effectively limited each trial to 8 to 10 minutes, too 
short a time to observe significant movement."

It'd be fun to build a gyroscope device measuring spacetime curvature 
and frame-dragging....

http://en.wikipedia.org/wiki/Gravity_Probe_B

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