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A refractive index comparator for the microscope

Published online by Cambridge University Press:  14 March 2018

A. T. J. Dollar
A. T. J. Dollar*
Affiliation:
Department of Geology, University of Glasgow
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Extract

This stage-attachment simplifies microscopic comparison of refractive indices of small transparent grains by the immersion-liquid methods of O. Maschke, Schroeder van der Kolk, and other workers. It was designed in 1938 for use in mineralogy and petrology, but has applications in several branches of pure and applied chemistry, patticularly for determining the relative purities of numerous raw materials and refined products of the chemical industry and in checking the constituents of glasses, slags, refractories, and cements. It can be used with advantage, also, in the optical study of soils.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 28 , Issue 203 , December 1948 , pp. 438 - 446
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1948

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References

page 438 note 1 Maschke, O., Pogg. Ann., 1872, vol. 145, pp. 565–568 Google Scholar; Niedemann's Ann. Physik, 1880, vol. 11, pp. 722–734.

page 438 note 2 Schroeder van der Kolk, J. L. C., Kurze Anleitung zur mikroskopischen Krystallbestimmung. Wiesbaden, 1898, pp. 11–14. Tabellen zur mikroskopischen Bestimmung der Mineralien nach ihren Brechungsindex. Wiesbaden, 2 Aufl., 1906.Google Scholar

page 438 note 3 Becke, F., Sitz.-ber. Akad. Wiss. Wien, 1893, vol. 102, Abt. I, pp. 358–378.Google Scholar

page 438 note 4 Schroeder van der Kolk, J. L. C., Zeits. wiss. Mikroskopie, 1892, vol. 8, pp. 456–458.Google Scholar

page 443 note 1 No. 19 S.W.G. is suitable, and the length may be fused into one end of a small glass rod for greater manipulative convenience.

page 444 note 1 Depending upon the direction of tilt of the main tube and upon whether the specific gravities of the grains are greater or less than the specific gravity of the immersion liquid.

page 445 note 1 Larsen, E. S., Bull. U.S. Geol. Surv., 1921, no. 679, pp. 22–23.Google Scholar

page 445 note 2 Christiansen, C., Niedcmann's Ann. Physik, 1884, vol. 22, p. 298; 1885, vol. 24, p. 439.CrossRefGoogle Scholar

page 446 note 1 Harkins, W. D. and Brown, F. E., Journ. Amer. Chem. Soc., 1919, vol. 41, pp. 499–524.CrossRefGoogle Scholar