The American house-carpenter; a treatise upon architecture, cornices and mouldings, framing, doors, windows, and stairs. Together with the most important principles of practical geometry (1852)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 153
nd 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, b f and be. If A and B… … Fig. 190. 253.—Another example: let Fig. 190 represent a piece olframing commonly called a crane, which is used for hoistingheavy weights by means of the rope, B b /, which passes over apulley at b. This is similar to Fig. 187 and 188, yet it is mate-rially different. In those figures, the strain…
Carpentry · Architecture
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