Ames, William L. (William Lewis), 1855-, Wischmeyer, Carl · New York, McGraw-Hill book company, inc.; [etc., etc.] · leaf 38
/^angle which the line makeswith the other plane of projec-tion, to find the other projection. Given B and 6 (Fig. 45).Consider the line revolved intoa position parallel to V, whenceBf will make the angle d withX and ^i* will be parallel toX. Make the counter revo-lution, which will give the… … Fig. 46. 28 DESCRIPTIVE GEOMETRY Note.—the limits of the value of 0 + </. are 0° and 90°. First Method.—Suppose 6 in Fig. 46 to 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…
Geometry, Descriptive
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