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Scientific American, Vol. 90, No. 14 (1904) (1904)
leaf 3
cumulator; latter to describe an arc in a it was originally intended to af- vertical plane and its pencil to ford a ready means of preparing draw a straight line across the ferric oxide. paper below the transverse rod and in the vertical plane with it. —2-oo—___ During the month of Febru- A… … © 1904 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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