Cyclopedia of architecture, carpentry, and building : a general reference work . down, represents the equilibrant of thetwo upward pulls on the ring; and with arrowhead pointing up, itrepresents the resultant of those two forces. 142 STATICS 9 12oltos. golToa. 8olbs^ 7olbs. 5olbs. Notice especially how the arrowheads are related in the tri-angle (Fig. 3), and be certain that you understand this lav. beforeproceeding far, as it is the basis of most of this subject. Exainjples. Fig. 5 represents a board 3 feet square to whichforces are applied as shown. It / is required to compound or findthe re
Cyclopedia of architecture, carpentry, and building : a general reference work . down, represents the equilibrant of thetwo upward pulls on the ring; and with arrowhead pointing up, itrepresents the resultant of those two forces. 142 STATICS 9 12oltos. golToa. 8olbs^ 7olbs. 5olbs. Notice especially how the arrowheads are related in the tri-angle (Fig. 3), and be certain that you understand this lav. beforeproceeding far, as it is the basis of most of this subject. Exainjples. Fig. 5 represents a board 3 feet square to whichforces are applied as shown. It / is required to compound or findthe resultant of the 100- and 80-pound forces. First we make a drawing ofthe board and mark upon it thelines of action of the two forceswhose resultant is to be found, asin Fig. 6. Then by some conven-ient scale, as 100 pounds to theinch, lay off from any convenientpoint A, a line AB in the direc-tion of the 100-pound force, and make AB one inch long, repre-senting 100 pounds by the scale. Then from B lay off a line BCin the direction of the second force and make BC, of an inch. loolbs. leolbs.
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