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Scientific American, Vol. 43, No. 24 (1880) (1880)
leaf 4
ed to J. B. Stoner, August 12, 1878, and June 1, proved revolving scraper mounted upon wheels, which is so the covers and leaves secondaries; and as will be readily seen, | 1880. These scales are intended for use in warehouses, each secondary is directly opposite its corresponding pri- constructed… … notches are necessary that the secondary fea- other parts cut into the ground. © 1880 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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