Re: making an air wedge with microscope slides

[brian whatcott <inet@INTELLISYS.NET>]

A use for Young's eriometer is to estimate small particle sizes from
the scattering angle for a minimum in the halo seen round a particle.
where theta = 1.22 wavelength / average diameter of particle.

Brian W



At 04:10 12/6/99 -0600, you wrote:
> 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.
brian whatcott <inet@intellisys.net>
Altus OK