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 401
lf the arc that subtends it; that is,the angle ABC {Fig. 264) is equal to half the angle ADC.Through the centre D draw the diameter BE. The tri-angle A B D \s an isosceles triangle, A Z>and B D being ra-dii, and therefore equal; hence, the two angles at F and Gare equal {Art. 338), and the sum… … Fig, 264, at H is measured by the arc A E, which subtends it, there-fore the half of the angle at H would be measured by thehalf of the arc A E ; and since G is equal to the half of //,therefore G or A B E is measured by the half of the arc A E.It maybe shown in like manner that the angle E B C…
Carpentry · Architecture · Building
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