Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 77
and an icosahedron, respectively. 58 DESCRIPTIVE GEOMETRY [V. §50 50. To Construct the Projections of a Tetrahedron. Inwhatever 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 projection.… … plan can be drawn from considerations of symmetry. Theelevation is started by locating o6 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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