Building construction and superintendence, by F.E. Kidder ... (1896)
Kidder, Frank E. (Frank Eugene), 1859-1905 · New York, W.T. Comstock · leaf 113
Fig. 57- consists essentially of a counterpoised wooden lever, 10 feet long,working on a horizontal pin, between two broad uprights, 20 inchesfrom one end. Along the top of the long arm runs a grooved wheelcarrying a weight, W. The distances from the fulcrum in feet and
Building
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