FW: Re: [ATM] Card in the foucault test

["mlbrown@everstrive.com" <mlbrown@everstrive.com>]

Here's my site introducing you to Foucault:
http://host67.everstrive.com/~mlbrown/ASTRONOMY/FoucaultTest.html

There are other excellent sites.  Go to http://www.atmsite.org/keyword.html
and look under Foucault.  This one: 
http://www.atmsite.org/contrib/Harbour/Foucault.html 
is quite thorough.

=Matt

Original Message:
-----------------
From: Bob May bobmay@nethere.com
Subject: Re: [ATM] Card in the foucault test


The purpose that the paper has is to guide you to the proper alignment of
the test.  When the light return goes past the KE, cutting off some of that
beam by the KE, you will see shadows on the mirror's surface of what you are
tending to indicate.  When you are far from the ROC of the mirror, the KE's
shadow will proceed from one side to the other - same direction being inside
the ROC and opposite being outside the ROC - while the KE being within the
range of ROCs of the surface of the mirror produce various shapes.
[snip]

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