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Projector for interference figures and for direct measurement of 2V

Published online by Cambridge University Press:  14 March 2018

H. C. G. Vincent
H. C. G. Vincent*
Affiliation:
Department of Geology, University of Cape Town
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Abstract

The instrument is designed for the study and measurement of the optical characters of crystals and anisotropic materials. The conoscopic phenomena, over a wide area for any selected orientation of the specimen, may be brought into view on a hemispherical screen, without the use of a microscope or lens system. The parts of the interference figure retain their true angular relationships, directly displaying for observation or measurement values of 2V for any angular separation of the optic axes.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 30 , Issue 229 , June 1955 , pp. 666 - 671
Copyright
Copyright © 1955, The Mineralogical Society

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References

page 666 note 1 Quirke, T.T., Direct projection of optic figures. Amer. Min., 1938, vol. 23, pp. 595–605..Google Scholar[M.A. 7249.]

1 Winchell, H., Demonstration of interference figures. Amer. Min., 1947, vol. 32, pp. 588–589..Google Scholar[M.A. 10468.]

2 Hurlbut, C.S., Jr., Demonstration polariseope. Amer. Min., 1955, vol. 40. pp. 120–122. Google Scholar

3 Vincent, H.C.G., Min. Mag., 1954, vol. 30, p. 513 CrossRefGoogle Scholar.