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Re: [ATM] blank internal stress checking with polarizers.

Attila Schné wrote:
> Hi,
>
>
> I norally use the ordinary window glass for such a test. Works great!
> Or I use two pieces of polarizing filter palte 10x10 cm,putting both
> side of the blank one-one plate, and turn them 90 degrees.  And moving
> around the disk.
>
Didn't I hear somewhere that it works even better if you stack a few up?
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