Checking for flaws in the 21 ton glass blank of the 200 inch mirror for the Mount Palomar telescope, Corning Glass Works, Ithaca, New York, 1935 [955x748] via /r/spaceporn https://ift.tt/2PK39Xv
via Tumblr https://ift.tt/2R6m9w1
Checking for flaws in the 21 ton glass blank of the 200 inch mirror for the Mount Palomar telescope, Corning Glass Works, Ithaca, New York, 1935 [955x748] via /r/spaceporn https://ift.tt/2PK39Xv
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