350 



INDEX. 



Mil, definition of the, 27 



Millivoltmeter, the, 50 



Momentum, electric, 141 



Morse telegraph, the, 3, 323 



Motor, the electric, 124 



Multiplying coils for voltmeters, 50 



Multipolar dynamo, the direct-current, 



130 

 Mutual inductance, definition of, 156 



Napier's diagram, 312 

 Non-inductive circuits, 143 



Ohm, definition of, 26, 99 



the international standard, 26 

 Ohm's Law, 37 



application of, to a portion of a 



circuit, 38 

 Open-circuit cells and closed-circuit cells, 



20 



Oscillations, electric, 242 

 Oscillator, the electric, 252, 254 

 Osmosis, electric, 321 

 Ozone, the production of, 233 



Parallel and series connections, 44 



Paramagnetic substances, 87 



Patterson and Carhart, Electrical Meas- 

 urements ', 162 



Patterson, G. W. , Determination of Elec- 

 trochemical, Equivalent of Silver, 8 



Peltier effect, the, 316 



Permanent magnet, the, 62, 83 ' 

 magnets, aging of, 83 



Piezo-electricty, 318 



Pith-ball electroscope, the, 209 



Polarized relay, the, 324 



Polarization of the voltaic cell, 43 



Poles of a magnet, 62 



Potential-difference, definition of, 40 



Potential, electric, 1 86 



energy of a charged condenser, 170 



Potentiometer, the, 282 



Power, measurement of, 284 



Poynting, J. H., On the Energy Stream, 



245 

 Primary coil of induction coil, 132 



Printing telegraph, the, 327 



Pyro-electricity, 317 



Pyrometer, the thermo-electric, 315 



Quadrant electrometer, the, see electro- 

 static voltmeter 



Quadrantal compass correctors, 304, 306 

 Quadruplex telegraphy, 326 



Radio-activity, 234 

 Relay,' the polarized, 324 



the telegraph, 323 

 Residual magnetism, 83 

 Resistance, combined, of a number of 

 branches, 47 



electrical, 25 



measurement of, 26, 278 



specific, see resistivity 



temperature coefficient of, 33 

 coefficients of, table of, 28 



variation of with temperature, 31 

 Resistivity, definition of, 27 

 Resistivities of alloys, 28 



table of, 28 

 Rheostat, the, 30 



the water, 30 

 Roentgen rays, 230 

 Rosa, E. B., papers on Measurement of 



Inductance, 144 

 Ruhmkorff coil, the, 131 

 Rutherford, E., Radio-activity and Ra- 

 dio-active Transformations, 234 



Saturation, magnetic, 84 

 Secondary coil of induction coil, 132 

 Selenium, properties of, 321 

 Self-induced electromotive force, 146 

 Self-induction, coefficient of, see induc- 

 tance 



Semicircular compass correctors, 301 

 Series and parallel connections, 44 



and shunt field windings, 129 



dynamo, the, 129 

 Ship's compass, the, 298 



magnetism, the, 299 

 Shunt and series field windings, 129 



dynamo, the, 129 



