Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 39
be one of the points of the required line,then all the lines pass-ing through h andmaking an angle <^with V will lie on thesurface of a cone hav-ing h as vertex andthe circle d^e^ei^df asa base, the line 6*a*representing the slantheight of the cone and.inclined at the angle<t> to X.… … bf!. X- 4- projection of an element makingthe required angle with H.With this length as radius and&* as center draw the arc cuttingX at the points d* and e*. Thecorresponding V projections willbe d, di, e and e-C, giving fourpossible positions of the line. This problem may be solvedequally well…
Geometry, Descriptive
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