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When the length of the compass needle may be neglected compared with the distance of the iron which acts on a ship’s compass, the deviation is accurately expressed by the formula sinδ =A cosδ + B sin ξ' + C cos ξf'+ D sin (ξ + ξ')+ E cos (ξ+ ξ'); in which ξ is the azimuth of the ship’s head measured eastward from thecorrect magnetic north ; ξ' is the same azimuth, but measured from the direction of thedisturbed needle ;

proceedings of the royal society of london

On the effect produced on the deviation of the compass by the length and arrangement of the compass needles; and on a new mode of correcting the quadrantal deviation