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A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 113
Fig. 94.—Apparatus for demonstrating the parallelo-gram of forces. x, P=~ W=Wtana.h •(1) 88 DYNAMICS CHAP. Also, T _AB IVJ~BC~h I T=~ W=W sec a.h •(2)Physics
Internet Archive · Gerstein Library, University of Toronto · Public Domain Mark 1.0. Free to use for anything.
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