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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 blue pole bowl brought nearer centimetres CHAP chart complete compensation complete turns 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 exceed 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 observation for normal obtain the normal opposite original position paper weight pass the lubber place of observation poles are set poles contrary position of normal practical rules quantity reading found 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