The American house carpenter. A treatise on the art of building. Comprising styles of architecture, strength of materials, and the theory and practice of the construction of floors, framed girders, roof trusses, rolled-iron beams, tubular-iron girders, cast-iron girders, stairs, doors, windows, mouldings, and cornices; together with a compend of mathematics. A manual for the practical use of architects, carpenters, stair-builders, and others (1880)
Hatfield, R. G. (Robert Griffith), 1815-1879, Hatfield, O. P., ed · New York, J. Wiley & sons · leaf 397
J {Fig. 259), the vertical, or opposite angles,A and C, are equal. Thus, FE, standing upon H J^ formsthe angles B and C, which together amount {Art. 333) to tworight angles ; in the same manner, the angles A and B formtwo right angles; since the angles A and B are equal to Band C^ take the same… … 345.—Proposition.—The three angles of any triangle areequal to two right angles. Let ABC {Fig. 260) be a giventriangle, with its sides extended to /% E and D, and the line(7 6^ drawn parallel to BE. As 6* 6^ is parallel to EB,\\\qangle at H is equal {Art. 331) to the angle at Z ; as the linesFC…
Carpentry · Architecture · Building
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