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 398
.—Corollary—If any two angles of a triangle amountto a right angle, the remaining one is a right angle. 349.—Corollary.—If any two angles of a triangle are to-gether equal to the remaining angle, that remaining angle isa right angle. 350.—Corollary.—If any two angles of a triangle are eachequal to… … 352.—Proposition.—If from the extremities of the di-ameter of a semicircle two straight lines be drawn to anypoint in the circumference, the angle formed by them at thatpoint will be a right angle. Let ABC {Fig. 261) be a givensemicircle; and ^ ^ and i5 (7 lines drawn from the extrem-ities of the…
Carpentry · Architecture · Building
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