Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 146
alf the line F G; and by projecting thepoint of intersection H of the horizontal and oblique planes by a perpendicularH H, and noting where this line cuts the circle above referred to, two pointsH and I are determined in the curve. Additional points are obtained similarly.The preceding methods…
Mechanical drawing
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