Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 145
exterior elements of thecone. Given the projections of a cone, and the direction of a plane X X, cutting itperpendicularly to the vertical, and obliquely to the horizontal plane; required 128 ORTHOGRAPHIC PROJECTION. to find, firsts the horizontal projection of this section; and, secondly, the… … in E, and join E S; thenanother perpendicular letfall from e will intersectE S in a point e\ whichwill be the horizontal pro-jection of a point in thecurve required ; and so onfor any number of points. The exterior genera-trices A S and B S beingboth projected upon theline A B, the extreme lim-its…
Mechanical drawing
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