New refractometers employing diamond and other minerals
Published online by Cambridge University Press: 14 March 2018
Extract
Direct-reading refractometers depend upon observation of the boundary between transmission and total internal reflection, when a flat surface of a specimen is placed in optical contact with the flat surface of the isotropic medium employed in the instrument. This medium is usually a heavy lead glass in the form of a hemisphere or prism. The upper limit to the range of indices which can be measured is determined by two factors: the refractive index of the medium employed in the instrument, and the refractive index of the liquid used to make optical contact between the two surfaces.
Liquids of high refractive index are essential to such instruments, and some reference to them may be conveniently made at this stage. Various pure liquids, mixtures, and melts of high refractivity have been proposed from time to time, chiefly as immersion media.
- Type
- Research Article
- Information
- Mineralogical magazine and journal of the Mineralogical Society , Volume 25 , Issue 170 , September 1940 , pp. 579 - 583
- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland 1940
References
page 579 note 1 Anderson, B. W. and Payne, C. J., Nature, London, 1934, vol. 133, p. 66. [M.A. 5–503.]Google Scholar
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page 579 note 4 West, C. D., Amer. Min., 1936, vol 21, p. 245. [M.A. 6–460.]Google Scholar
page 580 note 1 Tully, B. J., Min. Mag., 1927, vol. 21, p. 324.CrossRefGoogle Scholar
page 581 note 1 Anderson, B. W. and Payne, C. J., Gemmologist, London, December 1937. [M.A. 7–131.]Google Scholar
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