Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 17
ns of the line. (Fig. 13.) 15. Projecting Planes are planes containing two ormore projecting lines. 16. The Traces of a line or plane are the intersections ofthe line or the plane with the coordinates, and the two tracesof the same plane must always meet in the same point inthe Ground-Line,… … Fiy Fig. 15
Shades and shadows · Geometry, Descriptive
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