Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 211
(5= V F Fig. 386. 71 & combinations of levers are used, the principle of which can be understood from Fig.Thus, suppose P F to be 7, a F 2, a ¥ 9, l ¥ 2, b ¥ 11, F W 3^ P is to force a as a F to P F, or as 2 to 7 Force a is to 5 as b¥ to a F, or as 2 to 9 &istoWasFWto&F, oras 3 to 11 P… … Fig. 387.
Mechanical drawing
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