298 



INDEX. 



Electric arc, potential, Definition of, 165 

 due to a line doublet, 183 

 due to line charge, 176 

 in the neighborhood of a 



charged sphere, 168 

 spark in a gas, atomic theory of, 279 

 wave, Conception of, 251 



pulse, 208 



waves and electric oscillations, 193 

 Essential features of, 207 

 reflection of, 212 

 Electrodynamometer, The Siemen's, 31 



The Weber, 33 



Electrometer, The absolute, 152 

 Electromagnetic action, 245 

 Electromagnetism and ferromag- 



netism, i 

 Electromotive force, Induced, Law of, 



37 



Self induced, 49 

 Electron theory, The, 274 

 Electrons and ions, 276 

 Electrostatic attraction of charged 



plates, 150 



unit of charge, The, 156 

 Energy, Flow of, in the electromagnetic 



field, 253 

 stream, Mechanical conception of 



253 

 Equipotential surfaces, 166 



Farad, Definition of, 126 

 Ferromagnetism and electromag- 



netism, i 



Field, electric, between co-axial cylin- 

 ders, 156 

 between concentric spheres, 



154 



Energy and tension of, 153 

 Intensity of, 138 

 magnet, Definition of, 4 

 Magnetic, Mechanical conception 



of, 246 



The electric, 137 



Flames, Electric, Conductivity of, 287 

 Flinders' bar, 114 

 Flow of energy in the electromagnetic 



field, 253 



Fluoscope, The, 286 

 Flux density in iron, Magnetic, 87 

 electric, Definition of, 141 

 Magnetic, Definition of, 39 

 turns, Discussion of, 48 

 Focusing tube, Crookes, The, 286 

 Forced oscillation of a transmission 



line, 241 



Fortesque's method for designing in- 

 sulating structures, 187 



Galvanometer, The ballistic, 124 



The tangent, 22 



Gauss' method for measuring earth's 

 magnetic field, n 



theorem, 142 

 Geissler tube, The, 280 

 Gilbert, The, Definition of, 81 

 Graded cable insulation, 158 

 Growth of current in a circuit, 54 



Heeling error of ship's compass, 115 

 Hertz oscillator, Mechanical conception 



of, 261 

 Hysteresis, Dielectric, 159 



loss in iron, 100 



Magnetic, 98 

 Hysteretic coefficient, Values of, 100 



Images, Electric, Method of, 180 

 Impure waves and pure waves, 222 

 Induced Electromotive force, Law of, 37 

 Inductance, Definition of, 47 



Mutual, Definition of, 64 



of transmission line, 60 

 Induction, Magnetic. See Flux Density. 

 Inductivities, Table of, 127 

 Indued vity of a dielectric, 127 

 Insulating bushing, Condenser type of, 



148 

 Condenser type of, 190 



structures, Design of, 187 

 Insulator, Best shape of, 147 

 Intensity of Magnetization, 85 

 lonization of a gas by collision, 278 

 Ions and electrons, 276 

 Iron, Magnetization of, 75 



Kinetic energy of a current in a circuit, 

 53 



Lenz's principle, 37 



Line charge, Electric potential due to, 



176 



doublet, 183 

 of force, Definition of as a unit of 



flux, 39 



Geometrical definition of, 6 

 oscillation, Electric, 228 

 surges, Transmission, 217 

 Transmission, Forced oscillations 



of, 241 



Inductance of, 60 

 Load on a telephone line, 226 

 Lorenz's method for the absolute meas- 

 urement of resistance, 71 



Magnet, Behavior of in a magnetic 

 field, 8 



