Lange, David C. (David Christoph) · New York, John Wiley & sons, inc.; [etc., etc.] · leaf 19
s 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, although… … POINTS, LINES AND PLANES 7 17. The Profile Plane is a plane perpendicular to theGround-Line and hence to the Horizontal and AerticalCoordinates, taken for convenience on the left side. Pro-jections of objects on the Profile Plane are shown by revolv-ing the Profile Plane about its Vertical Trace…
Shades and shadows · Geometry, Descriptive
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