INDEX. 



Currents, secondary, 253 ; circular pro- 

 perties of, 722 ; parallel, 756 ; mea- 

 surement of, 826 ; by fall of potential, 

 868 ; transient, 883 ; broken, 898 ; 

 alternating, 900, 1107; investigation 

 of in the variable state, 906 ; inter- 

 mittent, 1055 ; Foucault's, 1261. 



Curve of demagnetisation, 417, 1195; 

 characteristic, 1274. 



Cylinder, 373; Faraday's, 15; mag- 

 netised, potential of a, 356 ; mag- 

 netisation of a, 412 ; moment of 

 inertia of a, 701. 



Cylinders, concentric, 80. 



Cylindrical systems, 132; magnets, 410; 

 coil, 495. 



D 



DAMPING, 843; of compass needle, 

 589; method of, 1120; of a magnet 

 or a frame, 1 106 ; of oscillations, 

 678. 



Daniell's cell, 263. 



Declination, magnetic, 305, 1159. 



Declinometer, 1159. 



Decrement, logarithmic, 681. 



Deflection, methods of, 1145; bilateral, 

 901 ; observations of, 880. 



Degree, gramme, 917. 



Dellmann's electrometer, 799. 



Demagnetisation, curve of, 417, 1194. 



Demagnetising force, 407. 



Density, electrical, 18; magnetic, di- 

 mension of, 607; of a current, 918. 



Depolarization by diffusion, 260. 



Deprez's galvanometer, 852 ; and 

 d'Arsonval's galvanometer, 86 1. 



Derived units, 604. 



Detachment, method of, 1 197. 



Determination of electrical quantities 

 by the spark, 821. 



Diamagnetic substances, 289, 374, 402. 



Dielectric, polarization of the, no; 

 definition of, III. 



Dielectrics, 12, 20, 99, 192, 1005; 

 propagation of electricity in, 241 ; 

 propagation of undulations in, 629 ; 

 resistance of, 1291. 



Differential inductometer, 1067 ; gal- 

 vanometer, 883, 935, 981, 1054. 

 Diffusion, depolarization by, 260. 

 Dilatation, electrical, of glass, 653. 

 Dimensions of units, 604 ; of machines, 



I273- 



Discharge, disruptive, 821 ; electro- 

 meter, 824 ; of a condenser, 894 ; 

 measurement of a, 506 ; by the elec- 

 trodynamometer, 897 ; duration of a, 

 898; current of, 536. 



Discharges, measurement of, 1114; 

 method of, 1021 ; series of, 899. 



Displacement, Maxwell's theory of, 126; 

 in a magnetic field, 395. 



Distance, striking, 821, 822, 1240. 



Distribution of electricity in linear con- 

 ductors, 219 ; of energy, 1276 ; of 

 magnetism in magnets, 1211. 



Double refraction, electrical, 602. 



Duration of relative propagation of 

 electricity, 225 ; of a discharge, 898 ; 

 of an oscillation, 676. 



Dynamos, 1269. 



EARNSHAW'S theorem, 64. 



Earth, its magnetic moment, 441. 



Edlund's theory, 626. 



Effect, Peltier, 1032; Thomson, 1034. 



Elasticity, modulus of, 708; electrical, 

 126, 223. 



Electrical oscillations, 911 ; conduc- 

 tivity, 999. 



Electricity, two kinds of, 3 ; distribution 

 of, 8; on surface of conductors, 13, 

 33, 42; on linear conductors, 219; 

 quantity of, 1240. 



Electrocapillary phenomena, 270, 651. 



Electrochemical equivalent, 257. 



Electrodes, 212, 249; Wollaston's, 250; 

 polarization of the, 251, 252. 



Electrodynamic machines, 1257. 



Electrodynamometer, 505, 826, 863, 865. 



Electrolysis, 249; measurement of by 

 currents, 918. 



Electrolytes, 249 ; resistance of, 1003. 



