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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 axis of rotation binnacle blue pole bowl brought nearer centimetres chap complete compensation correct corrector magnets course deflection is obtained deflector set deviated card diameter dipping needle directive force disc distance division earth's horizontal force East or West eight principal points equal fore-and-aft magnets fore-and-aft plane four cardinal points give the normal heeling error instrument joining the centres line joining lubber line magnetic needle magnets in position mean method millimetre necessary normal deflection North and South North point obtain the normal opposite original position paper weight pass the lubber Place the magnets Placing the spheres poles contrary position of equilibrium position of normal practical rules quantity reading found Return the card sailing ships scale screw ship's head East ship's head North shore sine soft iron South line speed sufficient thwartship magnets Toulon verify vertical magnet West point