Building construction and superintendence, by F.E. Kidder ... (1896)
Kidder, Frank E. (Frank Eugene), 1859-1905 · New York, W.T. Comstock · leaf 271
ED and DD, and when there are three unknown forces we cannotdraw the stress diagram for that joint until one of the forces hasbeen found or assumed. At joint 2, we have but two unknownforces, viz., the stress in DD and DR, therefore, we can draw thestresses for this joint. In drawing the stress… … Fig. 277. the point o, we know that one end of ro must be at o, and as the forceacts down, the other end must be abozC, therefore to find the pointr, we measure upwards from o, 1,800 lbs., and r is the beginningpoint of the stress polygon for joint 2. We now have ro, od, andfrom d, draw a line…
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