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Scientific American, Vol. 47, No. 14 (1882) (1882)
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nt disk before beginning the grinding. This gigantic instrument, when finished, is to be erected on Mount Ham- of the curvature of the crown glass lens, outside surface, is telegraphically, nearer New York than Chicago is now. ilton, California. 265°8 inches; inner surface, 81°9 inches. These… … It is more than 6 feet long, grove. © 1882 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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