Abstract
IN the current number of Wiedemann's Annalen, Prof. C. Christiansen of Copenhagen resumes his researches on the indices of refraction of coloured liquids. The methods adopted consisted in the examination of the liquid in hollow prisms of very small refracting angle; a few drops of the liquid being placed between two small pieces of glass touching each other at one side, but separated about half a degree. Another method consisted in inclosing the liquid between a piece of very thin glass and a biprism made of a glass the index of refraction of which was known, the index of the liquid being calculated by taking the refraction as the difference of the two separate refractions of the glass and the liquid. Prof. Christiansen gives tables of results for water, alcohol, turpentine, and nitrobenzol, and also for solutions of permanganate of potash of various degrees of concentration. For the latter substance the results agree with the determinations of Kundt, but are probably more exact.
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Physical Notes . Nature 28, 308–309 (1883). https://doi.org/10.1038/028308b0
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DOI: https://doi.org/10.1038/028308b0