Marching line

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A liquid filled compass.

Marching lines are a pair of lines drawn on the glass of a compass, and arranged at 45 degrees to each other. These are an essential component in hiking through the wilderness. Most modern compasses have adjustable luminous marching lines.

See also

  • Azimuth
  • Beam compass
  • coordinates
  • fluxgate compass
  • gyrocompass
  • Gyrosin compass
  • gyrostatic compass
  • inertial navigation system
  • pelorus
  • radio compass
  • radio direction finder
  • surveyor's compass, or circumferentor

External links, resources, and references

  • USGS Geomagnetism Program
  • Amir Aczel, The Riddle of the Compass: The Invention that Changed the World, ISBN 0-15-600753-3
  • Joseph Needham, Colin A. Ronan: The Shorter Science & Civilisation in China Vol 3 Chapter 1 Magnetism and Electricity.
  • Science Friday, "The Riddle of the Compass" (interview with Amir Aczel, first broadcast on NPR on May 31, 2002).
  • Paul J. Gans, The Medieval Technology Pages: Compass
  • Frederic Lane, "The Economic Meaning of the Invention of the Compass", American Historical Review, vol. 68, pp. 605-617 (1963)
  • The Tides By Sir William Thomson (Lord Kelvin)
  • Evening Lecture To The British Association At The Southampton Meeting on Friday, August 25, 1882 [1]. Refers to compass correction by Fourier series.
  • Admiralty manual of navigation, Chapter XXV The Magnetic Compass (continued) the analysis and correction of the deviation, His Majesty's Stationary Office, London, 1914.
  • Arrick Robots. Example implementation for digital solid-state compass. ARobot Digital Compass App Note
  • Williams, J.E.D. From Sails to Satellites. New York: Oxford University Press, 1992.
  • Frances and Joseph Gies, Cathedral, Forge, and Waterwheel subtitled "Technology and Invention in the Middle Ages".
  • Petra G. Schmidl Two Early Arabic Sources on the Magnetic Compass