Hostname: page-component-77c89778f8-7drxs Total loading time: 0 Render date: 2024-07-19T11:23:03.123Z Has data issue: false hasContentIssue false
  • English
  • Français

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
Get access

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

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

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.