The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 417
A IT equals unity, JIJ isthe sine ;AJ the cosine ; BJ the versed sine ; B K the tangent; andA K the secant. When the number of degrees contained in a given angle is known,then the value of the sine^ cosine^ dc, corresponding to that angle, maybe found in a table of Natural Sines, Cosines, (fee. In… … Fig. 867. given angle. At any distance from A^ draw c perpendicular to ^ ^.By any scale of equal parts obtain the length of each of the three linesa, 5, c. Then for the angle at A we have, by proportion, c a : c :: 1-0 : sm. = -. 1-0 1-0 1-0 1-0 COS. tan. = cot. = sec = 1-0 : cosec. a b a c V h c a…
Carpentry · Architecture
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