Archived posting to the Leica Users Group, 1998/10/01

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Subject: Re: [Leica] CorningWare optics
From: "James Harrison" <>
Date: Thu, 1 Oct 1998 20:35:19 -0500

Alexey wrote::
>Don't forget that it was Corning that solved the problem of casting a 
>200-inch mirror for Mt. Palomar. Existing glasses had coefficients of
>thermal expansion too great for such a large casting to cure without
>cracking. Borosilicate glass was invented by Corning in response...
>remember Palomar next time you use a borosilicate (Pyrex, Corningware) 
>baking dish!
Who made the glass for the Hubble Space Paper Weight?  jh