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Practical Guide for Compensation of Compasses Without Bearings
Alfred Joseph Collet
No preview available - 2015
accuracy additional magnets already in position alter angle axis of rotation binnacle centimetres chap chart cnan compass on board complete compensation correct corrector magnets counterpoise course deflection is obtained deflector set deviated card diameter dipping needle directive force distance division earth's horizontal force East or West equal fore-and-aft magnets fore-and-aft plane four cardinal points give the normal Globes heeling error hemisphere instrument joining the centres line joining lubber line magnetic force magnets in position means method millimetre necessary normal deflection North and South North point observation for normal obtain the normal opposite original position paper weight place of observation Place the magnets poles contrary position of equilibrium position of normal practical rules quantity reading found Return the card scale screw ship's head East ship's head North shore sine soft iron South line Southern hemisphere speed sufficient thwartship magnets Toulon Traite de Regulation verify vertical magnet West point