Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 361
io. As in Fig. 766, take 0 as thecentre of motion and A A the distance to which the point A is to be moved bya half revolution; with C as centre and a radius C A describe a circle and di-vide the semicircle into eight equal arcs, and draw the radii C 1, 0 2, C 3, etc.On A A as a diameter describe a… … Fig. 767. A
Mechanical drawing
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