Kenison, Ervin, Bradley, Harry Cyrus, 1871-1936 · New York : The Macmillan Company · leaf 26
Fig. 6. … Fig. 9. Fig. 10. 6 DESCRIPTIVE GEOMETRY [I, § 6 The planes of projection are chosen, • accordingly, the firsthorizontal, the second perpendicular to the first, and thereforevertical. These two planes are known as the horizontal andvertical coordinate planes, respectively, and will be designatedby…
Geometry, Descriptive
Internet Archive · California Digital Library · Public Domain Mark 1.0. Free to use for anything.
