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Re: making an air wedge with microscope slides

One of the first commercial applications of light interference was a setup
like the one Fred Brace describes. It was used to measure the thickness of
wool. The inventor...Thomas Young?...was looking for a way to get some
money out of interference. I think it was called an eriometer.

Digby Willard




Responding to the message of Sun, 05 Dec 1999 14:07:06 -0700
from fred brace <fredb@TELEPORT.COM>:

I've been able to get it to work with ordinary slides I tighten a rubber
band around one end of a pair of slides and slip a hair in the other end.
It shows good interference lines if you hold it up to the light in the
proper position.