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 557
I -O : COS. B a c a : b : : I -O : tan. B _ b a b : a : : i-o : cot. B a~b a : c : : I -o : sec. B _ ca b : c : : I -0 : cosec .B c Or, in any right-angled triangle, for the angle containedbetween the base and hypothenuse— When perp. divided by hyp., the quotient equals the sine. * base hyp.. perp.… … name of the trigonometrical term ; thus, in the above exam-ple, for the sine of ABC we write sin. B: for the cosine,cos. B, etc. EQUATIONS TO RIGHT-ANGLED TRIANGLES. 515 By these proportions the two acute angles of a right-angled triangle may be computed, provided two of thesides are known. For…
Carpentry · Architecture · Building
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