The Pulfrich Effect: Rigby's (2002) Proof of Nickalls' Theorem

Rigby, J. F. A proof of Nickalls' theorem on tangents and foci of a conic. Mathematical Gazette, 2002, 86 (July), pp. 322 - 324.
Newton 1726, p. 293:  Construction showing that a fluid-pressure field must be scalar.

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The Pulfrich Effect, SIU-C. Last updated 2006-03-06