A Treatise on Magnetism: General and Terrestrial

acting pole angle of deflection attraction axle azimuth bifilar bismuth coefficient coincide collimator corresponding curve declinometer deduced deflecting magnet denote determined diamagnetic direction distance diurnal inequality Earth's magnetic force east longitude easterly force effect epoch equal fluids Force at Dublin force exerted formula free magnetism hemisphere Hence horizontal circle horizontal force horizontal plane inclination inducing action instrument intensity latitude latter lunar magnetic axis magnetic declination magnetic equator magnetic meridian magnetic moment magnetic pole magnetometer magnitude maximum mean yearly values method molecule moment of inertia months nearly needle netic north pole northerly force numbers observations opposite paramagnetic perpendicular plane of detorsion polarity quantity readings repelled repulsion Sabine scale secular change similar poles Sir James Ross soft iron southern hemisphere steel suspended magnet suspension thread telescope temperature terrestrial magnetic theodolite tion torsion variations vertical force vibration weight Δη