Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 56
State the ratios betweei^the segments of the projections and tho.se of the true length. III. § 31] PROJECTION OF LINES 37 31. Traces of a Line. Every normal-case line, if sufficientlyextended, meets the planes of projection in points which arecalled the traces, or piercing points, of the line. (See… … Fio. 32 b indicates a trace of a line.vt = vertical trace.ht = horizontal trace,vt = horizontal projection of vertical trace,ht vertical projection of horizontal trace. Fig. 32 oFigure 32 b shows in projection the same line as was used in32 a. Let it be required to §nd its traces As the line is…
Geometry, Descriptive
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