Notes and examples in mechanics; with an appendix on the graphical statics of mechanism; (1903)
Church, Irving P. (Irving Porter), 1851-1931 · New York, J. Wiley & sons; [etc., etc.] · leaf 124
a little puzzling to the student because the PIER-REACTTO]SrS—GRAPHICS. 115 amounts and direction of the two auxiliary, mutually annulling,forces P and P are not known at the outset. Hence we here present a construction in which those twoforces are completely assumed and known at the outset.… … Fig. 12i portion of the force-polygon with the known forces 1, 2, 3, and4, beginning at 0^ and the first three rays, I, II, and III (dotted).The first segment of the corresponding equilibrium polygonshould begin at a^ the intersection of the action-lines of forces 1and 2, and finally the third…
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