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.
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 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. Robotics.com 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 Gies 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