Archived posting to the Leica Users Group, 1998/10/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]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