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 561
35°) is 9-8452268Log. of <^ (= 100) is 2-0000000 Perpendicular, b (= 70-02075) = i -8452268 And for the hypothenuse, taking equation (190.), wehave— COS. B Or: The Jiypothcmise equals the quotient of the base dividedby the cosine of the acute angle at the base.For this we have— Log. of a (= 100)… … ular, base, and hypothenuse, respectively equal to 70-02075,100, and 122-0775. N.B.—The angle at A {Fig.^if) is obtained by deductingthe angle at B from 90° {Art. 346). Thus, 90 — 35 = 55 ;this is the angle at y^, in the above case. If the perpendicular be given, then for the base useequation…
Carpentry · Architecture · Building
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