The elements of natural philosophy : copiously illustrated by familiar experiments and containing descriptions of instruments, with directions for using : designed for the use of schools and academies (1856)
Sprague, A. W. (Alfred White), 1821-1891 · Boston : Phillips, Sampson & Company · leaf 43
and steelyard are examples of the applicationof the first kind of lever. Thelatter, as seen in Fig. 17, hasthe length of its arms unequal.The body to be weighed is sus-pended from a hook near the ful-crum, and counterpoised by asmall weight, moveable upon theother, or long arm; the weightswhich…
Physics
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