Kenison, Ervin, Gardner, Harry W, Lawrence, William Henry, 1868-, Everett, Herbert E. (Herbert Edward), 1863-1932, Gregg, D. A. (David A.), Von Holst, H. V. (Hermann Valentin), 1874-1955, Brown, Frank Chouteau, 1876-1947, Griffin, Charles Lewis, 1867-, Neubecker, William, 1864-, Zapf, Alfred E, American School (Lansing, Ill.) · Chicago, Ill. : [American School of Correspondence] · leaf 271
llel lines meet? (18) How is the perspective of any point found? (19) How is the perspective of the vanishing point of any system of lines found ? (20) What will be the perspective of a straight line? (21) What is meant by the horizon ? (22) What is meant by the plane of the horizon ? THE PLANES OF… … jection. The vertical plane is the picture plane (§ 6 and Fig. 7) on which the perspective projection is made, and corresponds exactly to the vertical plane, or vertical coordinate used in ortho- graphic projections. 259
Mechanical drawing
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