Practical engineering drawing and third angle projection, for students in scientific, technical and manual training schools and for ... draughtsmen .. (1897)
Willson, Frederick Newton, 1855-1939 · Princeton, N.J., The author · leaf 38
d froma table. A draughtsman has such freguent occasion to use these functions that they are given here for reference, both as lines,and as ratios. Trigonometric Functions as Eatios. Trigonometric Functions as Lines. e = the given angle = CA B h = hypothenuse of triangle CAB a = A B = side of… … A«^ B The prefix co suggests complement; the co-sine of B is the sine of the complement of 5, &c. As lines the functions-may be defined as follows : The sine of an arc (e. g., that subtended by angle 6 in the figure) is the perpendicular {CB) let fall from one extremity ofthe arc upon the…
Mechanical drawing · Lettering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
