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 227
cil of osculating conies we may startwith the construction of § 41, 9, Fig. 67. There it was shownthat the picture of a circle in a perspective collineation whose 214 PROJECTIVE GEOMETRY. center lies on the axis of collineation and also on the given circleis a conic osculating the given circle at… … Fig. 90. counter-axes vary, the pictures of a fixed circle K throughA-i^A^A^A^ form clearly a pencil of osculating conies. On every ray g (or the identical g/) through a fixed point B(assumed infinitely distant) this pencil cuts out an involutionwhose double-points are two points on the cuspidal…
Geometry, Projective · Geometry, Analytic
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