The Pulfrich Effect: Nickalls' Theorem (1986)

Nickalls, R. W. D. A line-and-conic theorem having a visual correlate. Mathematical Gazette, 1986, 70, pp. 27 - 29.
Galileo 1638, p. 246:  Construction in the proof that a projectile's path is parabolic.

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The Pulfrich Effect, SIU-C. Last updated 2005-07-31