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Re: [ATM] 7 inch spherical mirror
Dominic-Luc Webb wrote:
> Does anyone know for sure that Schmidt ever used a vacuum
> method?
The accounts I have seen of the history of the Schmidt-type telescope
(e.g, Henry C. King's "The History of the Telescope", p. 357; Ronald
Florence's "The Perfect Machine: Building the Palomar Telescope, p. 259.)
are consistent on the point that he shaped the corrector plate by drawing
a vacuum behind a glass disk and polishing a flat surface on the exposed
face of the slightly-flexed disk.
-dave w
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