Machine drawing; a text and problem book for technical students and draftsmen (1921)
Svensen, Carl L. (Carl Lars), 1884- · New York, D. Van Nostrand company · leaf 91
Fig. 150. Levers and Handles. The length of a lever is from center to center of holes or an equivalentdistance as illustrated. The three classes of levers are shown in Fig. 151. In each case the Shaft Le^^er of 1st Class PL, = WL2 ,. Ppull k p Ley^er of 2nd Class -Lr w PL. = WL- W -Lz- -Ap Leyer of…
Machinery
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