The Pulfrich Effect: Lit & Hyman (1951)

Lit, A. and Hyman, A. The Magnitude of the Pulfrich Stereophenomenon as a Function of Distance of Observation. American Journal of Optometry and Archives of the American Academy of Optometry, 1951, Monograph No. 122, 1 - 17.
Newton 1726, p. 52: Construction showing that a centripetal force to the focus of an elliptical orbit must represent an inverse-square law.

Newton 1726, p. 52: Construction showing that a centripetal force to the focus of an elliptical orbit must represent an inverse-square law.

Posted with permission of the American Academy of Optometry:
A. Lit and A. Hyman,
"The Magnitude of the Pulfrich Stereophenomenon as a Function of
Distance of Observation",
American Journal of Optometry and
Archives of the American Academy of Optometry,
Monograph No. 122 of November 1951, pages 1 - 17.
Copyright (c) The American Academy of Optometry
1951.

Galileo 1638, p. 292, Construction to show that a horizontal beam must bend under load.

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Galileo 1638, p. 135: The breaking length of a horizontal column.

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The Pulfrich Effect, SIU-C. Last updated 2000-08-07