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An improved polarizing microscope

Published online by Cambridge University Press:  14 March 2018

A. F. Hallimond  and
E. Wilfred Taylor
A. F. Hallimond
Affiliation:
Museum of Practical Geology, London
E. Wilfred Taylor
Affiliation:
Messrs. Cooke, Troughton, and Simms, Ltd., York
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Extract

In recent years there has been little essential change in the design of the petrological microscope. F. E. Wright directed attention to the improvement that could be obtained by using a full-sized condenser with a large polarizer, but the high cost of the latter seems to have restricted its use to a few special models.

With the introduction of ‘polaroid’, a thin, intensely pleochroic film mounted between glass disks, this restriction no longer holds. A polarizer can be supplied of sufficient size to cover an ordinary Abbe condenser, while the analyser no longer requires the compensating lenses which usually accompany a calcite prism, with the indirect result that the definition of the interference-figure is improved.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 27 , Issue 193 , June 1946 , pp. 175 - 185
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1946

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References

page 175 note 1 Published by permission of the Director, Geological Survey and Museum.

page 175 note 2 F. E. Wright, The methods of petrographic-microscopic research. Carnegie Inst. Washington, 1911, Publication 158.

page 177 note 1 The Bertrand lens described is covered by British Patent Application No. 24755/44, which is controlled by the Department of Scientific and Industrial Research.

page 178 note 1 Wright, F. E., The formation of interference figures.… Journ. Optical Soc. Amer., 1923, vol. 7, p. 779. [M.A. 2–369.]CrossRefGoogle Scholar

page 181 note 1 Berek, M., Optische Messmethoden im polarisierten Auflicht.… Fortschr. Min. Krist. Petr., 1937, vol. 22, p. 1. [M.A. 7–250.]Google Scholar

page 181 note 2 Capdecomme, L. and Orcel, J., Détermination des propriétés optiques des cristaux opaques.… Revue d'Optique théorique et instrumentale, 1941, vol. 20, p. 47.Google Scholar

page 181 note 3 Wright, F. E., The position of the vibration plane of the polarizer in the petrographic microscope. Journ. Washington Acad. Sci., 1915, vol. 5, p. 641.Google Scholar