Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 68
s shown in Figs. 87 and 88. Thesecondary plane Vx intersects H in a secondary ground line,GXLX, which may be at any angle with the original groundline GL. Since the projectors aav and a<V, Fig. 87, are bothparallel to H, the distances ave and a^j are equal, both beingequal to aah, the distance… … Fig. 87. Fig. 88. 1. Tlie plane may be viewed from either side, irrespective ofthe ])osition of the object, but the direction of sight must alwaysbe at right angles to the plane (§ 5), and the projectors must bedrawn at right angles to GXLX. 2. Distances above II mast be laid off on the farther…
Geometry, Descriptive
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
