Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 186
ive thesolution of the present problem. Construction (Fig. 247). The plane Q is given by its tracesHQ and VQ, and ar is given as the position of a point which 164 XVII, § 147] COUNTER-REVOLUTION OF PLANES 165 has been revolved about HQ into H. Assume a secondaryground line GXLX perpendicular to HQ.… … Fig. 247. point to axv in VXQ. Then axv is the secondary projection ofthe point a. Project from axv perpendicular to GXLX, and fromar perpendicular to HQ. Both of these lines must pass throughah, which is thus determined. To find a, we now have given a*as one projection of a point lying in the…
Geometry, Descriptive
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