Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 147
Let C E D and 0 B A be the two cones, and X X the position of thecutting plane. Project in plan either of the cones, as Z* E D; from its centre,with a radius equal to L H, describe a circle, and draw the tangent ha; hawill be the horizontal projection of the cutting plane. Draw the line H…
Mechanical drawing
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