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Scientific American, Vol. 59, No. 26 (December 1888) (1888)

leaf 3

An illustration from Scientific American, Vol. 59, No. 26 (December 1888), 1888, leaf 3
the handle end of which rests inthe bracket on the longer upright, and is adapted toreciprocate, or to be held at any desired point. Uponthe upper edge of each of the lever arms a curvedbeam is secured, the ends of the beam being attachedto the lever arms within the standards, and from thesecurved… … FICHES FOBTABLE EXTENSION LADDEB. ) 1888 SCIENTIFIC AMERICAN, INC. December 29, 1888.J ^mntxfu %mtvUm. 403 the center of the lever arms has a crank arm at eachend for rotating the shaft, upon which are pinions, onepinion adapted to engage and reciprocate the ap-proaching racks on each side of the…

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