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It would be amusing to see how small you can
make the [Cavendish] apparatus. I'll bet it wouldn't be
too hard to make it smaller than a breadbox.
You can get some very small fibers cheaply
and easily as follows: Go down to the boat
store and get some good Dacron kernmantel
rope. Cut through the outer braid with a razor
knife. Pull. Inside you will find angel
hair, so fine that a single strand can't
be seen unless the light hits it just right.
One strand can only support a few grams. I
haven't measured or calculated the torsional
spring constant, but it must be reeeeally
small.
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