A text book of physics, for the use of students of science and engineering (1918)
Duncan, John, d. 1941, Starling, Sydney George, 1873- · London Macmillan · leaf 115
V7777777777777777777 Fig. 98.—Model derrick crane. 90 DYNAMICS CHAP. C merely changes the direction of the cord without altering the force init; hence P =W (Fig. 99 (a) ). The polygon of forces (Fig. 99 (b) ) is drawnby making ab represent W, and be represent P ; lines are then drawnfrom a parallel… … Fig. 99 —Forces in a derrick crane. The values of Q, and T so found will not agree very well with those shownby the spring balances. This is owing to the weights of the parts of theapparatus not having been taken into account. Approximate correctionsmay be applied to the spring balance readings by…
Physics
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