Marching line

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.[1][2][3][4][5][6][7][8][9][10][11][12][13]

A liquid filled compass.

History

See also

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