Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 30
el planes are parallel.19. From the foregoing illustrations it willbe observed that the ground line is the hori-zontal projection of the vertical coordinate PLANES 13 plane, and that any point, line, or plane lyingin Fwill have its entire horizontal projectionin the ground line. Likewise, it will… … Fig. 31.
Geometry, Descriptive
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