From: "Jerry B. Hillman" 
To: 
Reply-To: "Jerry B. Hillman" 


Hi all,
I think I deduced the cause of a consistant problem I have been having with
the Foucault Test.
I elaborate on it here and a possible fix with pictures.
http://www.convertabarn.com/foucault_tester.htm

Basically, I think the separation between the light souce and the KE is
causing image displacement behind the KE when I am examining the edge of
the mirror.  Testing the edge of the mirror seems to make the KE side of
the mirror disappear behind the KE at about the time it starts nulling the
edge. Then again, I could be totally wrong. Clear skies, Jerry

--- BBBS/NT v4.00 MP