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The use of alignment charts in crystal-optics
Published online by Cambridge University Press: 14 March 2018
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
- Information
- Mineralogical magazine and journal of the Mineralogical Society , Volume 20 , Issue 110 , September 1925 , pp. 441 - 443
- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland 1925
References
Page 441 note 1 Hutchinson, A., Min. Mag., 1912, vol. 16, pp. 236–288.CrossRefGoogle Scholar
Page 441 note 2 Wright, F. E., Amer. Journ. Sci., 1913, set. 4, vol. 86, pp. 509–539.CrossRefGoogle Scholar
Page 442 note 1 Palmer, H. S., Professional Paper U.S. Geol. Survey, 1918, no. 120-G pp. 123–128.Google Scholar