The Pulfrich Effect: Nickalls' Theorem (2000)

Nickalls, R. W. D. A conic theorem generalised: directed angles and applications. The Mathematical Gazette, 2000, 84, pp. 232 - 241.
Newton 1726, p. 50: Construction showing inverse decline of centripetal force, given an elliptical orbit.

This paper presents a new proof of Nickalls' Theorem, generalizing it to directed angles and to all possible arrangements of the line and conic.

A full-text PDF copy of this article may be downloaded from the publisher's site, using an external link.

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The Pulfrich Effect, SIU-C. Last updated 2000-12-29