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 37
A S \ *s°, \ /,■ … THE MACHINIST AND TOOL MAKERS INSTRUCTOR. do marked sine and cosine are correct, but if we were to figurethe complement of this angle, then the vertex of the anglewould be at B, the sine, and cosine would then exchangeplaces, because the sine never touches the vertex of the anglewhile the cosine…
Machinery
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