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Re: Sextants with Polarizing filters
From: Ken Muldrew
Date: 2006 Jan 25, 20:02 -0700

From:                   Bill 

> George
>
> Sorry you do not endorse my paraphrase ;-) Googled filters today, and
> a maker of fine optics, Schneider, used the same analogy (albeit a
> better explanation--a picket fence:

Bill,
If you have 3 polarizers you can easily see how the picket fence analogy
fails. Simply line up 2 filters with a space between them. Rotate one until you
get maximum darkening (here the axes of polarization are at 90? to each
other). Now insert the 3rd polarizer in between the other two. Suddenly light
passes through all three! How could the middle polarizer change the
orientation of the other two "picket fences"?

Ken Muldrew.

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