Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 151
completethe parallelogram of forces, ebfd; then b d, the diagonal of the 136 AMERICAN HOUSE-CARPENTER. parallelogram, will be the direction, and its length will be theamount, of the united pressures of A and of B. The line, b d, istermed the resultant of the two forces, h f and he. If J. and B are… … Fig. ISO, 253.—Another example: let Fig. 190 represent a piece offraming commonly called a crane, which is used for hoistingheavy weights by means of the rope, Bhf, which passes over apulley at h. This is similar to Fig. 187 and 188, yet it is mate-rially different. In those figures, the strain is…
Carpentry · Architecture
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