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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 73

An illustration from 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, leaf 73
Fi?. Mi. 143.—Proposition. A diagonal crossing a parallelogram di-vides it into two equal triangles. Let abed, [Fig. 101,) be agiven parallelogram, and 6 c, a line crossing it diagonally. Then,as a c is equal to b cZ, and a b to c d, the angle at a to the angleat d, the triangle. A, must, according… … Il-. 10- 144.—Proposition. Let a h c d^ (^Vo-- 102,) be a given pa-rallelogram, and 6 c a dingoiial. At any distance between a b andc c?, draw e/, parallel to a b; through the point, g, the intersectionof the lines, b c and ef, draw h «, parallel to b d. In every paral-lelogram thus divided, the…

Carpentry · Architecture

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