From: "Galogaza" 
To: 
Reply-To: "Galogaza" 


Hallo Stathis,

Nice pictures.
How did you exactly made them.
Specificaly, How big was polariser (width x height) and how far from the
mirrors back.

I do not know much about stress detection by polarized light but is it
possible that this test detects not only internal stress but also
nonhomegeneity of the glass. If so than annealing perhaps could remove
stress from nonhomogen glass leaving it nonhomogeneos. That will explain
why you have no problems with this
on the first sight very stressed glass. I remember images of one big
historical mirror ( perhaps MtWilson) somebody said was made from bottles. 
It was visible that mirror was very inhomogeneous. My conclusion is that it
is possible that inhomogeneity is compatible with nonstressed glass.

Comments appreciated.

Vladimir.

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