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An eyepiece micro-planimeter

Published online by Cambridge University Press:  14 March 2018

H. B. S. Cooke
H. B. S. Cooke*
Affiliation:
Department of Geology, University of the Witwatersrand
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Extract

Occasion arose recently when the writer required to make a number of comparative areal measurements of irregularly shaped portions of fossil corals in thin section, and it was found that the micrometric methods available were very tedious and involved considerable strain. A micro-planinmter has now been designed by means of which fairly accurate determinations of areas can be made with a minimum of eye strain. Though intended primarily for use with the petrographical microscope with the rotating stage, it can be adapted for use on microscopes of the fixed stage type.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 25 , Issue 166 , September 1939 , pp. 388 - 394
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1939

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References

Note

page 393 note 1 Johannsen, A., A descriptive petrography of the igneous rocks. 1931, vol. 1, pp. 140–158.Google Scholar