[time-nuts] Primary standard again

J. Forster jfor at quik.com
Tue Feb 23 21:42:51 UTC 2010


A REAL "primary standard" is something that you can assemble the kit of
parts anywhere in the Universe, flip the switch, and get exactly the same
time interval as anywhere else.

That obviously does NOT apply to the pendulum, as it depends on the value
of G.

-John

==================


> I suppose a pendulum can be a primary standard at some accuracy.  Using
> the "kit of parts" analogy, if one builds the pendulum and operates it at
> sea level, the period of the pendulum is entirely determined by the
> physical dimensions and the gravitational constant.





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