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 50
.*! Fig. 49. … F=Pcosec (x= P -r- Bin a. (The summation of horizontal andvertical components put equal to zero would give the same result.)^is tension; F, compression. Next take the free body in Fig. 50, involving the known forceP and the unknown stresses P^ I, and Z,assuming for them the characters implied bythe…