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== Pranala luar ==
{{Commons}}
* [http://www.magnet.fsu.edu/mediacenter/slideshows/compass/index.html How to Make a Compass] {{Webarchive|url=https://web.archive.org/web/20081230152722/http://www.magnet.fsu.edu/mediacenter/slideshows/compass/index.html |date=2008-12-30 }} 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] {{Webarchive|url=https://web.archive.org/web/20031216131745/http://scholar.chem.nyu.edu/tekpages/compass.html |date=2003-12-16 }}
* Evening Lecture To The British Association At The Southampton Meeting on Friday, August 25, 1882 [http://zapatopi.net/kelvin/papers/the_tides.html]. Refers to compass correction by [[Fourier series]].
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