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Scientific American, Vol. 24, No. 11 (1871) (1871)
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ve, and may be used with Across one end and near the top of the frame aie placed two a eneth- 23D 0 ——— RAILROAD JACK. picking rolls, formed with screw threads on each roll, and excellent results either alone or in combination with en- graving or répoussé relief. A matted ground is then valua-… … invented by Alfred D. Fox, of Oil City, Pa. It consists of a per tun for industrial purposes. “ Other exhibitors,” he says, “show some good pieces,” but An ordinary two-horse power used for thrashing will drive © 1871 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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