A text-book of physics, largely experimental. On the Harvard college "Descriptive list of elementary physical experiments." (1891)
Hall, Edwin Herbert, 1855-1938, Bergen, Joseph Y. (Joseph Young), 1851-1917 · New York, H. Holt and Company · leaf 134
By comparing the triangle WP with the triangle whosesides are L, B, and H we see that P:W(oTW)::H:L, or or, 91. Force Applied Parallel to Base. — This case is illus-trated by Fig. 74. THE PARALLELOGRAM OF FORCES. \ 11 The line Wf is not here, as it is in Fig. 73, the hypothe-neuse of the triangle… … w FIG. 74. sufficient, with N, to balance W. We have, from a com-parison of the triangles, P:W(QiW)::H:B, or PXB=WXH,or, P=WX(H~B). EXPERIMENTS. By means of apparatus No. XX, used as in Figs. 75 and 76, theconclusions of §§90 and 91 can be illustrated. In Fig. 76 the hori-
Physics
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