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Re: interferometer

Hi, Scott.  I did look at Pasco's interferometer, but it seemed much
less flexible.  It's set up to do one thing, and you can't do other
things with it.  Thor's is a much more general device.  Of course, this
is closely related the Thor system requiring set up while the Pasco isn
turn-key.  But I'm sure the set up and tuning can't be as bad as the
Cavendish experiment.

I agree that any equipment of this kind is small and hard to see for a
group presentation.  But we must have other equipment with the same
problem.  What have we generally been doing? We certainly could afford
more AV equipment, but what should we get?