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 90
y between Horizontal and Vertical Projections ofa Plane Figure. RABATTEMENT. i. The orthographic projections of a figure in a plane o1Sa2are perspectives with infinitely distant centers in directions per-pendicular to H and V. In this case any of the projections andthe corresponding revolved figure… … Fig. 27. 2. Let P be the bisecting plane of the first and third angles,Q the bisecting plane of the second and fourth angles. The pro-jections 0) a point in P are equally distant from GL; those of apoint in Q coincide. Hence, to find the point of intersection 0} any line I with Q,produce I and I…
Geometry, Projective · Geometry, Analytic
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