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Published online by Cambridge University Press: 20 January 2009
Dygogram is the name of a curve, invented by Archibald Smith and employed in his Admiralty Manual of the Deviation of the Compass, to give a graphic representation of the varying magnetic field of a compass as the ship is swung round in azimuth; a description is given of the Dygogram by Maxwell in Electricity and Magnetism, §441.