Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 38
er at II is the sine^ the line B A perpendicular to B C and inter-secting the extended radius at A is the tangent^ the extension of the radius C Dto the intersection of the tangent at A the secant; the versed sine is the lineB H extending from the sine to the tangent. The cosine^ cotangent^… … Fig. 22 CONSTRUCTION OF GEOMETRICAL PROBLEMS.
Mechanical drawing
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
