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

References

    Further reading

    • Amir Aczel, The Riddle of the Compass: The Invention that Changed the World, ISBN 0-15-600753-3
    • Admiralty manual of navigation, Chapter XXV The Magnetic Compass (continued) the analysis and correction of the deviation, His Majesty's Stationary Office, London, 1914.
    • Paul J. Gans, The Medieval Technology Pages: Compass
    • Frances Gies and Joseph Gies, Cathedral, Forge, and Waterwheel subtitled "Technology and Invention in the Middle Ages".
    • Frederic Lane, "The Economic Meaning of the Invention of the Compass", American Historical Review, vol. 68, pp. 605-617 (1963)
    • Joseph Needham, Colin A. Ronan: The Shorter Science & Civilisation in China Vol 3 Chapter 1 Magnetism and Electricity.
    • Petra G. Schmidl Two Early Arabic Sources on the Magnetic Compass
    • Science Friday, "The Riddle of the Compass" (interview with Amir Aczel, first broadcast on NPR on May 31, 2002).
    • The Tides By Sir William Thomson (Lord Kelvin)
    • Williams, J.E.D. From Sails to Satellites. New York: Oxford University Press, 1992.

    External links

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