Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 31
raw the lines D e and D e; from a and i, with thegiven radius equal to <2 A or J B, describe the arcs A e and B e. From D, asa centre, with a radius equal to C D, and, consequently, by construction, equalto D e and D e, describe the arc e C e. The entire curve A e C e B is thecompound curve… … Fig. 41.
Mechanical drawing
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