Abstract
SOME years ago a method was described by N. Umow (Zeitschrift für physikalische Chemie, 1899, xxx., 711) for demonstrating objectively the rotation of the plane of polarisation of light by an optically active liquid such as a solution of sugar. The method was an ingenious application of Tyndall's experiment on the effect of an opalescent liquid on a beam of polarised light. It consisted in rendering a concentrated solution of sugar some-what turbid by adding to it a small quantity of an alcoholic solution of resin; on passing an intense beam of plane polarised light into this solution spirals of light of the spectrum colours were seen round the walls of the tube, the colours being, of course, due to rotation dispersion.
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PATTERSON, T. The Objective Demonstration of the Rotation of the Plane of Polarisation of Light by Optically Active Liquds . Nature 79, 249 (1908). https://doi.org/10.1038/079249e0
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DOI: https://doi.org/10.1038/079249e0
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