From: "Mark Clement" 
To: ATM{at}shore.net
Reply-To: "Mark Clement" 


Hello, again
While I have brought my surfaces (those referred to in recent
postings) to  spherical figures, I still am attempting to
correct  the mirrors' edges. Since I'm not certain what it is I'm
dealing with, "trail-and-error" probably best defines my efforts.

Superficially, I seem to have cases of TDE: outside ROC the Ronchi
shadows hook very sharply to the outside, replete with
a thin, tapering "tail" that runs parrell with the optical edge;
inside ROC however, things are a little bit stranger-the shadows are
capped, so to speak, such that they (the shadows) break in
both directions near the edge, something like a
"T" with a slanted top, if you catch my meaning. Obviously I have
created some sort of undesireable zone. What am I describing, and how do I
prevent/remove it in the future?
Mark Clement
P.S. Throwing the mirrors against my basement wall is not
an option,
although it would effectively remove the zones. . . 
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