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The use of alignment charts in crystal-optics

Published online by Cambridge University Press:  14 March 2018

A. Hutchinson*
Affiliation:
University of Cambridge

Extract

The widespread use of methods based oil total-reflection for finding the refractive indices of crystals either directly, by the Abbe-Czapski crystal reflectometer or by the Kohlrausch method, or indirectly by means of liquid mixture of known refractive intex which require to be verified and standardized from time to time, renders desirable a rapid graphical method of ascertaining with some accuracy the index of the substance under test, direct from the instrumental data without calculation.

An attempt in this direction was made by the author some years ago. The equation to be solved is n' = n sin θ, where n' is the index to be found, n that of the glass hemisphere, prism, or highly refracting liquid employed in the total-reflectometer, and θ the critical angle of total-reflection observed.

Type
Research Article
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1925

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References

Page 441 note 1 Hutchinson, A., Min. Mag., 1912, vol. 16, pp. 236288.CrossRefGoogle Scholar

Page 441 note 2 Wright, F. E., Amer. Journ. Sci., 1913, set. 4, vol. 86, pp. 509539.CrossRefGoogle Scholar

Page 442 note 1 Palmer, H. S., Professional Paper U.S. Geol. Survey, 1918, no. 120-G pp. 123128.Google Scholar