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Scientific American, Vol. 60, No. 13 (1889) (1889)
leaf 7
ed on the inner and outer No one, perhaps, in the present edges of the segmental part of the central plate. The graduations may be of two systems, on each face, one system indicating by the English and the other by the Mr. metric system, making a combination of readings on both sides of the… … © 1889 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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