An introduction to projective geometry and its applications; an analytic and synthetic treatment (1905)
Emch, Arnold, b. 1871 · New York, J. Wiley & sons; London, Chapman & Hall, limited · leaf 88
a point (but only one point). 2. Straight Line.—^A straight line is determined by twopoints (the only line or curve determined by two points). Anorthographic projection (of course, also a perspective) of a straightline is also a straight line. Hence, if A, A; B, B are theprojections of two points,… … Fig. 26. are the corresponding projections of the Hne AB. Generally any straight line—when produced—pierces H and V. The points where this occurs are called the traces of the line and may conveniently be designated by /j, /j; 5^, s^, etc. (^1 = horizontal, /^ = vertical trace). A point P is…
Geometry, Projective · Geometry, Analytic
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