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IX.—Note on Captain Weir's Azimuth Diagram and its anticipation of a Spherical Triangle Nomogram

Published online by Cambridge University Press:  15 September 2014

Herbert Bell
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Extract

In a paper* read before this Society in 1889, Captain Weir gave a diagram for solving graphically, by means of a chart and parallel ruler, the polar spherical triangle whose vertices are the pole, zenith, and a star, so as to obtain the Azimuth when the declination, hour-angle, and latitude are known. The purpose of this note is to show that this diagram is in reality equivalent to the later straight-line nomogram, and to deduce a similar diagram to Weir's for another problem in spherical trigonometry.

Type
Proceedings
Information
Proceedings of the Royal Society of Edinburgh , Volume 36 , Issue 1-2 , 1916 , pp. 192 - 198
Copyright
Copyright © Royal Society of Edinburgh 1916

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References

page 192 note * “Theoretical Description of a new ‘Azimuth Diagram’ by Captain Weir, Patrick,” Proc. Roy. Soc. Edin., vol. xvi, No. 129, p. 354.Google Scholar

page 195 note * Annales Hydrographiques, Paris, 1904.

page 196 note * This was subsequently partially remedied by Perret by an additional construction. See Assoc. française pour l'avancement des sciences, 1905, p. 93.

page 196 note † Bulletin Astr., t. xi (1894), p. 5; Soc. Mach. France Bull. (1904), p. 196.