The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 74
d, must, accord-ing to Art. 141, be equal to the line, dc; and the angle at b mus*be equal to the angle at c. A ^^ / ^v^ V B i / B </ c i d c Fis 101. 143.—Proposition. A diagonal crossing a parallelogram di-vides it into two equal triangles. Let a b c d^ [Fig. 101,) be agiven parallelogram, and… … Fig. 102. 144.—Proposition. Let abed, {Fig. 102,) be a given pa-rallelogram, and 6 c a diagonal. At any distance between a b andc d, draw e /, parallel to ab; through the point, g, the intersectionof the lines, b c and e/, draw h i, parallel to b d. In every paral-lelogram thus divided, the…
Carpentry · Architecture
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