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Scientific American, Vol. 30, No. 11 (1874) (1874)
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of the globe. efficient of expansion as the glass, is applied, to several inch- but 3°8 feet in diameter and weighing 3,498 pounds, required The mode of arranging these stages is, of course, a matter es in thickness. The mirror is next inverted, placed on a 1,270 hours of continuous labor to bring… … © 1874 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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