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==External links==
==External links==
* [http://msi.nga.mil/MSISiteContent/StaticFiles/HoMCA.pdf] Handbook of Magnetic Compass Adjustment.
* [http://msi.nga.mil/MSISiteContent/StaticFiles/HoMCA.pdf Handbook of Magnetic Compass Adjustment]
* [http://www.magnet.fsu.edu/mediacenter/slideshows/compass/index.html How to Make a Compass] Audio slideshow from the National High Magnetic Field Laboratory
* [http://www.magnet.fsu.edu/mediacenter/slideshows/compass/index.html How to Make a Compass] Audio slideshow from the National High Magnetic Field Laboratory
* Paul J. Gans, [http://scholar.chem.nyu.edu/tekpages/compass.html The Medieval Technology Pages: Compass]
* Paul J. Gans, [http://scholar.chem.nyu.edu/tekpages/compass.html The Medieval Technology Pages: Compass]