Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 75
and an icosahedron, respectively. 58 DESCRIPTIVE GEOMETRY [V, §50 50. To Construct the Projections of a Tetrahedron. In whatever position a tetrahedron may be placed with referenceto the planes of projection, some of its edges will be normal-caselines; hence they will be foreshortened in… … plan can be drawn from considerations of symmetry. Theelevation is started by locating a^ft and c, which are known tolie in HA. The determination of the height of the point opresents some difficulty, since it is connected to the points sofar determined by lines that will be foreshortened in…
Geometry, Descriptive
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