Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 157
the axisa constant and invariable angle. Let A C F and K M 0 represent the concentric bases of the cylinders,whose common axis S T is vertical; the curve of the exterior helix A 0 E F A^is the first to be drawn according to the method above shown. Then, having setoff from A* to A the thickness of…
Mechanical drawing
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