INDEX. 



299 



Magnetic Field, 4 



pole, Strength of, 3 

 poles, i 



Distributed and Concen- 

 trated, 2 



circuit, Calculations of, 93 

 definition of electric current, 18 

 field, action of upon a coil, 28 

 Action of upon a magnet, 8 

 in a long coil, 24 

 Mechanical conception of, 246 

 near a long wire, 27 

 Tapering, Electric equation of, 



249 



flux, Definition of, 39 

 through iron, 85 

 induction. See Flux Density, 

 hysteresis, 98 

 permeability, 91 

 reluctance, Definition of, 95 

 Magnetism of a ship, 104 



Residual, 87 



Magnetization curves, 88 

 Energy of, 96 

 Intensity of, 85 

 of iron, 75 



Work required for, 96 

 table, 91 



Magnetizing force in iron, 82 

 Magnetomotive force, Definition of, 76 

 of a coil, 78 

 Units of, 8 1 



Maxwell's model of the ether, 246 

 Maxwell, the, Definition of, 39 

 Mechanical analogue of transformer, 62 

 of electric oscillator, 258 

 of energy stream, 253 

 of Poynting's theorem, 253 

 of the electric current, 252 

 of magnetic and electric fields, 



245 



and electrical parallels, 193 

 conception of electric field, 247 

 theory and atomic theory, 274 

 Mutual inductance, Definition of, 64 



Ohm, Definition of, 20 



Oscillation of a transmission line. 



Electric, 228 

 Oscillations, electric, 193 



forced, of a Transmission line 241 

 Oscillator, Electric, Mechanical con- 

 ception of, 258 

 The Electric, 195 

 Ozone machine, The, 288 



Permeability, Magnetic, 91 

 Poles of a magnet, i 



Potential, Definition of, 165 

 due to a line doublet, 183 

 Electric, Due to a line charge, 176 

 values in the neighborhood of a 



charged sphere, 168 

 Poynting's theorem, 253 



Examples of, 254 

 Pure waves and impure waves, 222 



Quadrantal correctors, 112 



error of ship's compass, 108 



Radioactivity, 289 



Reluctance, magnetic, Definition of, 95 



Residual magnetism, 87 



Ribbon rave. The, 209 



Roentgen rays, 285 



Secohmmeter, The, 135 



Self induced electromotive force, 49 



Semi-circular correctors, 107 



error of compass, 107 

 Ship's compass, Adjustment of, 116 



The, 104 

 magnetism, 104 

 permanent magnetism, 106 

 temporary magnetism, 106 

 Siemen's Electrodynamometer, The, 31 

 Simple mode of oscillation of transmis- 

 sion line, 234 

 Specific capacity of a dielectric. See 



Inductivity. 



inductive capacity. See Induc- 

 tivity. 

 Standing wave trains, clock diagram 



models of, 233 



waves, Experimental demonstra- 

 tion of, 244 



Strength of a dielectric, 132 

 of pole, Definition of, 3 

 Superposition, Principle of, 211 

 Surges on a transmission line, 217 



Tangent galvanometer, The, 22 

 Tapering electric field, Magnetic action 



of, 248 

 magnetic field, Electric action of, 



249 



Transformer, Alternating current, Elec- 

 tromotive force relations of, 45 

 Mechanical analogue of, 62 

 Transmission line, Capacity of, 173 

 Electric oscillation of, 228 

 Forced oscillations of, 241 

 Inductance of, 60 

 Maximum electrical stress be- 

 tween the wires of, 175 



