Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 322
ntersecting the line A B at 1, 2, etc.; fromthese centres describe arcs of a radius equal to the generating circle; from thepoints 1, 2, 3, etc., on the base circle, and with radii equal successively to the MACHINE DESIGN AND MECHANICAL CONSTRUCTIONS. 305 chords 0 1, 0 2, 0 3, etc., describe arcs… … Divide the circumference of the given circle into any number of equal parts,as 0, 1, 2, etc. At each of these points draw tangents to the given circle; onthe first of these lay off the distance 1-1, equal to the arc 0-1; on the secondlay off 2-2, equal to twice the arc 0-1 or the arc 0-2 ;…
Mechanical drawing
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