Smart, Edward Howard · London : Macmillian and Co. · leaf 6
28845I n f UNIVERSITY OF CALIFORNIA UB:RARY \ … THE CONIC SECTIONS. 1. Hyperbola. 2. Parabola. 3. Ellipsk. [In each of the above photographs the horizontal and vertical threads define aplane through the source of light parallel to the screen on which the light is received.Tlie latter thread, Ijeinf^ the common section of this j)lane ^%•ith the…
Geometry, Projective
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