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Re: [ATM] convex secondary

Ken,

I've been thinking the same thing, but haven't checked to see if it's so.  Sounds like we need to take a look.

Greg Jones


> In the old days, Pyrex blanks were moulded in forms
> and were very full of in-homogenities and striations
> (SP)? These could be easily seen on most any blank
> from several y. Lately, I've not seen visible (by eye)
> defects in the Pyrex disks that are currently
> available. I would think that testing through the back
> would be possible with today's glass.
> 
> Ken Hunter
> 
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