Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 123
dent on the ground line.An additional point in therequired line of intersec-tion may be found by theuse of an auxiliary profileplane of projection, as-sumed anywhere exceptthrough the coincidentpoints s and t. Find theprofile traces, PQ and PR,of the given planes (§ 60). These traces intersect in… … R is in quad-rants I %- 3, andmakes 60° with H Fig. 174.
Geometry, Descriptive
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