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Scientific American, Vol. 69, No. 22 (1893) (1893)
leaf 3
stroke only, and the feed is given by the worm ined, and the photographic apparatus is then so set up may be made to bear upon it are arranged in the side and sector shown behind it in ourengraving. The that the image of the ball falls on the right edge of the of the main tube. timber while it is… … cult to confound them with any other body. © 1893 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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