A Treatise on Magnetism Designed for the Use of Students in the University

angle angular momentum Astronomical Meridian attraction axis azimuth blue end blue magnetism blue pole broadside-on compass compass-needle correction cotan deflect deflexion deviation diagrams distance disturbed needle disturbing magnet Earth's action Earth's horizontal effect end-on experiment expression external magnetic Figure Greenwich hori horizontal action horizontal magnetic horizontal plane induced magnetism investigations longitude magnet-power magnetic force magnetic meridian Magnetic Pole mass of iron measured moment of inertia netism North Magnetic Pole numerical value observations opposite phænomena position produced proportion red end red magnetism red pole remarked represented repulsion rotation Royal Observatory sensibly shew ship ship's head soft iron steel magnet subpermanent magnetism supposed term terrestrial horizontal force terrestrial magnetism theodolite theory tion torsion-power total force transversal vertical force vibration wire zontal αλ δμ