INDEX. 



7 9 I 



Selenium, resistance of, 1005. 



Self-induction, 508, 534, 1097 ; of two 

 parallel wires, 759 ; of a coil, 780, 

 783 ; coefficient of, 519. 



Semicircular deviation, 1233. 



Sensitiveness of suspension of a bifilar 

 balance, 714; of methods for mea- 

 suring currents, 828; conditions of, 

 of Wheatstone's bridge, 953. 



Shells, magnetic, 329, 450 ; potential 

 of, 360 ; conducting, 574 ; plane, 

 575 ; dimensions of, 607, 608. 



Short magnets, 419. 



Shunts, 867 ; multiplying power of, 

 867. 



Siemens' galvanometer, 849. 



Sight, line of, 658. 



Silk threads, 713. 



Sine electrometer, Riess', 799 ; galvano- 

 meter, 832. 



Sinuous currents, 468. 



Sinusoidal currents, use of, 992. 



Sliding condensers, 1045. 



Solenoidal magnets, 328 ; potential of, 



371- 



Solenoids, simple, 326 ; complex, 329 ; 

 electromagnetic, 494, 552. 



Sonometer, 987. 



Spark, electrical, 821. 



Specific inductive capacity, 108, 634 ; 

 dimensions of, 607 ; heat of elec- 

 tricity, 281; inductive powers, 1294; 

 magnetism, 1295. 



Sphere, 73 ; moment of inertia of a, 

 701; polarized, 157; conducting in 

 a uniform field, 159, 161 ; dielectric 

 in a uniform field, 162 ; potential of 

 a magnetic, 355 ; magnetisation of a, 

 386, 409. 



Spheres, concentric, 77. 



Spherical layer, potential of a magnetic, 



369. 



Standard ohm, 921, 924 ; of capacity, 

 1043. 



Starboard angle, 1232. 



Steel, magnetism of, 1209. 



Strength, electromagnetic, 450; of cur- 

 rent, dimensions of, 607. 



Striking distance, 822, 1240. 



Subpermanent magnetism, 1231. 



Sun, its influence on terrestrial mag- 

 netism, 441. 



Supports, insulating, 819. 



Surface, equipotential, 23 ; magnetic, 

 315 ; of a cylindrical coil, 727. 



Susceptibility, magnetic, 383, 1200. 



Suspension, bifilar, 842. 



Swing, measurement of currents by, 

 882 ; observations of, 886. 



Symmetrical field, 131 ; electrometers, 

 799, 800. 



Syphon recorder, 860. 



Systems, cylindrical, 132 ; of revolu- 

 tion, 138; astatic, 299. 



TAIT'S hypothesis, 284. 



Tangent galvanometer, 503. 



Telegraph cables, induction in, 551. 



Telephone, 545. 



Telescope, 658. 



Temperature, influence of on torsion, 

 712; on bifilar suspension, 718; cor- 

 rection of resistance for, 929 ; in- 

 fluence of on magnetisation, 1208, on 

 resistance, 1291 ; on magnets, 303 ; 

 of inversion, 272 ; changes of in 

 magnetisation, 648. 



Temporary magnets, 288 ; magnetisa- 

 tion, 406. 



Tenacity, coefficient of, 711. 



Tension, electrical, 41, 104, 200. 



Terminals, 79^ 



Terrestrial field, 1159 ; magnetism, 1296. 



Test nail, Jamin's, 416. 



Theorem, Green's, 29 ; Coulomb's, 

 Gauss', 62 ; Eatnshaw's, 64. 



Theory, Ohm's, 200 ; Thomson's, of 

 electricity, 276 ; Weber's, 426 ; of 

 magnetism, 317 ; Poisson's, of mag- 

 netism, 317 ; Ampere's, .425, 498 ; 

 Maxwell's, of magnetism, 430. 



Thermal phenomena compared with 

 electrical, 121, 199, 242 ; conduc- 

 tivity, 998. 



Thermoelectrical currents, 291, 292 ; 

 powers, 277; couple, 271; electro- 

 motive force of, 282, 1035, 1293. 



Thickness, electrical, 18. 



