Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 321
l lines from C, passing through 1, 2,etc., and intersecting A B, give the points from which the arcs of the generat-ing circle are described; from the points 1, 2, 3, etc., on the base circle, andwith radii equal successively to the chords 0 1, 0 2, 0 3, etc., describe arcs cut-ting the preceding;… … Fig. Proceed as in the previous example and divide the generating circle andbase line into equal parts, describe the path of the centre of the generatingcircle A B concentric with the base circle, and from each division of the baseline draw radial lines from C, intersecting the line A B at 1, 2,…
Mechanical drawing
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