The machinist and tool maker's instructor, containing an easy method of calculating and laying out difficult work in the machine shop .. (1896)
Genung, Edward. [from old catalog] · New York [Press of J. B. Savage, Cleveland] · leaf 35
with an angle, the tangent of an angle is a straight linethat touches the circumference of a circle at one end, and ex-tending out to and meeting a secant at the other. It is alwaysat right angles (or perpendicular) to the radius. A secant is a straight line that is drawn from the centerof a circle…
Machinery
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
