Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 188
point 1 is the highestcorner of the square. The projections of each corner of thesquare are obtained by the method of Fig. 247, using a second-ary ground line perpendicular to HQ. Xote especially point 3. XVII, § 147] COUNTER-REVOLUTION OF PLANES 167 Since the edges of the square are lines lying in… … namely, the iT-traee of this line, and that this trace projects toGL in the point where 2V2> intersects QL. Similarly, lrIr and 1*4*, if produced, must intersec! HQ inthe same point. In fact, the counter-revolution may be effectedlargely by the use of the traces of the various lines, l>ut ;it…
Geometry, Descriptive
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