Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 174
the ele-vation, and intersect the projection of d atd by a ray of light from c; d is the high-est point in the curve. Take any horizon-tal line E F in the elevation and describefrom C on the plan an arc with a radiusequal to one half this line; draw from Cproject to e\ and from e as a centre… … Fig. 320. ray intersecting E F at e, which z^\ .. x i\ CL V 4^. \ / — 7I ^\Ji_ / i ¥■ / - I
Mechanical drawing
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