Lange, David C. (David Christoph) · New York : John Wiley & Sons ; London : Chapman & Hall · leaf 17
b i Xj ^, ^ 6 1 ^ b^K - 1 j1 11 1 1 11 ^\^ ■\.l a: 1 1 11 1 1 1 ^^i Fig. 19 \^ *^^ Ik ^^,. POINTS, LINES AND PLANES 7 17. The Profile Plane is a plane perpendicular to theGround-Line and hence to the Horizontal and VerticalCoordinates, taken for convenience on the left side. Pro-jections of objects…
Shades and shadows · Geometry, Descriptive
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