Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 65
l coordinates. (Figs. 5 and 6.) IL The true angle which the Conventional Ray ofLight makes with the Coordinate Planes is 35° 15 22. Theprojections of the same Ray make angles of 45° with theGL, or Coordinate Planes. (Figs. 6 and 7.) 12. A Plane of Light is any plane containing a Rayof Light. (Fig.…
Shades and shadows · Geometry, Descriptive
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