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On the use of the gnomonic projection in the calculation of crystals

Published online by Cambridge University Press:  14 March 2018

G. F. Herbert Smith
G. F. Herbert Smith*
Affiliation:
Mineral Department of the British Museum
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Extract

Considered from the crystallographical point of view the outstanding feature of the gnomonic projection is the fact that all great circles on the sphere, and consequently all zones on the crystal, appear on the diagram as straight lines. In order to secure its full advantages, it is necessary to take the plane of the paper at right angles to the axis of a zone, and preferably one of the principal zones of symmetry on the crystal.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 18 , Issue 86 , May 1919 , pp. 317 - 323
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1919

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References

page 319 note 1 See Mineralogical Magazine, 1902, vol. xiii, p. 126 Google Scholar.

page 320 note 1 This vol., p. 259.