Useful information for architects, engineers, and workers in wrought iron (1886)
Phoenix Iron Company · Philadelphia : Printed by J.B. Lippincott Co. · leaf 155
om 900.Supplement . . . . = its difference from 1800. TRIGONOMETRICAL EQUIVALENTS. v/ (i_Sin2) = Cosin. v/ (1—Cosin2) :— Sine. Sin ~ Tan — Cosin. Cosin :— Cotan = Sine. Sin X Cotan = Cosin. - Cotan = Tangent. Sine -i- Cos — Tangent. - Sin — Cosecant. Cos -r- Sine == Cotang. - Cosin = Secant. Sin2 +… … Example I. To find the angle a, when A D and W Dare given, from table of natural sines and tangents, p. 153. A D = 20. 10. W D A D being radius, W D = tan a. L VbD= Then 10 AD ~~ 20 : .50000. Referring to table we find for 260, the natural tangent to be .48773270, the natural tangent to be .50952…
Wrought-iron · Iron, Structural · Building, Iron and steel · Building
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