From: "Bob May" 
To: "atmlist" 
Reply-To: "Bob May" 


When you consider that the testing spec is very vague in it's quality
standard and that the annealing process is also a bit on the variable side,
it is no wonder that there is a certain vagueness to all of this. I'll note
that there is generally three grades of annealing, coarse - basically they
don't care about the annealing other than to insure that the glass isn't
tempered, fine, where it is fairly well annealed and good for most
purposes, and precision, where it is done to the customer's spec. You could
be getting in some of the glass you buy a reading that is well within the
precision spec but isn't listed as such because the test wasn't done to
that level, just that the glass was better than a certain point. Bob May
http://nav.to/bobmay
bobmay{at}nethere.com
NEW! http://bobmay.astronomy.net

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