Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 158
Fig. 214. XIV, § 137] THE REVOLUTION OF PLANES 137 with V. We find that HS intersects the axis at d, and theground line at g. Hence, d is the fixed point on HQ, while VQmust be tangent to the arc gj, drawn with center o and radius og. … Fig. 215. We now have one point each on HQ and VQ, and an arc towhich each is tangent. Therefore HQ and VQ are determined. Check. Since HQ and VQ are independently determined,they must intersect the ground line at the same point, n. If « and /3 are given as acute angles, as is usual, a solutionis…
Geometry, Descriptive
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