The Mathematical Theory of the Deviations of the Compass: Arranged for the Use of the Cadets at the U. S. Naval Academy |
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12-inch single Admiralty Standard Compass amplitudes angle axis azimuth binnacle centre compass card compass course components constant correct magnetic cos² curve of deviations determined diameter dipping needle directive force distance Dygogram earth and ship earth's horizontal force equal exact coefficients force acting force as unit force H force to north force to turn fore-and-aft line formulæ Hassler heeling error inches induced magnetism Limaçon magnetic bearing magnetic course magnetic force magnetic latitudes magnetic north mean force mean value Multipliers normal equations north end north point observed deviations obtained octantal term placed position quadrantal deviation quantities reduce to zero represent semicircular deviation sextantal deviation ship heels ship swinging ship's head shore sin+C sin² sin³ single needle soft iron correctors soft iron rods starboard Table tion tism total force versin vertical force vertical line vibrations westerly XVIII