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 86
position,and is designated by H; the other in a vertical position, • and isdesignated by V. Both H and V intersect each other in the COLLIN RATION. 73 ground-line GL and divide the whole space into four quadrants,or angles, Fig. 24. With respect to the observer, space may bedescribed as above or… … Fig. 24. In any of these angles, the projections of a point are obtainedas the foot-points of the perpendiculars (projectors, projectinghues) from these points to H and V. If A is the point in space,we may designate the horizontal projection of A, which is inH, by A^, the vertical projection of A…
Geometry, Projective · Geometry, Analytic
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