Duncan, J. (John), d. 1941 · London, MacMillan and co., limited · leaf 74
rizontally on three legs at A, B and C, asshown in plan in Fig. 70. Let a weight W be placed at any pointG, and let it be required to find the pressure on each leg due to W. PARALLEL FORCES 55 It will be noticed that if one of the legs, say A, be lifted slightly, thetable will rotate in a vertical… … In the same way, PB may befound by taking moments aboutAC, and Pc by taking momentsabout AB. The results may bechecked from EXPT. 6.—Principle of moments.Fig. 71 shows a wooden disc whichis free to rotate about its centreon a screw driven into a wallboard. Attach cords to various points on the face…
Mechanics
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