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The construction and use of the Moriogram

Published online by Cambridge University Press:  14 March 2018

G. F. Herbert Smith
G. F. Herbert Smith*
Affiliation:
British Museum
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Extract

The diagram (Plate III), to which for convenience the author has given the name moriogram, is intended to provide a method for rapidly determining the angles between a face of symmetry and all other faces with rational indices, which lie with it in some particular zone, when two of the angles are known, or, what is precisely the same thing, between a zone of symmetry and all other zones with rational indices, which intersect it in the same pair of opposite poles, when two of the angles are known : whenever possible it should be arranged that one of the known angles is a right angle. The meriogram may, therefore, be used in the course of computation for checking the accuracy of the work, or during the goniometrical measurement of a crystal for finding the relations subsisting between the faces or the zones.

Type
Research Article
Information
Mineralogical magazine and journal of the Mineralogical Society , Volume 14 , Issue 63 , October 1904 , pp. 49 - 53
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1904

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References

Page 49 note 1 μóριoν, a part.

Page 53 note 1 Min. Mag., 1903, vol. xiii, p. 313; Zeits. Kryst. Min., 1904, vol. xxxix, p. 146.

Page 53 note 2 Set of ‘R. H. S. Curves,’ by Professor Robert H. Smith, published by Camdl & Co., London.