INDEX. 



443 



Redistribution of charge, 36 

 Reflecting galvanometer, 202 

 Registering magnetographs and elec- 

 trometers, 146, 307^ 

 Rets, Philip, invention of telephone, 



Relation between currents and mag- 

 nets, 184, 318, 326, 391 

 between current and energy, 



378 

 between current and heat and 



light, 366 

 Relays, 426 



Replenisher, 45, 261, 262 

 Repulsion and attraction of electrified 



bodies, i, 3, 18, 20, 66, 236 

 and attraction, experiments on, 



and attraction of currents, 331 

 and attraction of magnets, 76, 



80 



Repulsion electrometers, 260 

 Residual charge of Leyden jar, 53, 272 

 of cable, 274, 430 

 of Voltameter, 272, 



4iS 



magnetism, 102 

 Resinous electricity, 4 

 Resistance, 27, 158, 179, 346 



absolute unit of, 363, 364 

 affected by temperature, 349 

 light, 389 

 sound, 436 

 as a velocity, 363 

 bridge or balance, 358 

 coils, 359 

 internal, of cell, 181, 350 



,, measurement 



of, 361 

 laws of, 347 

 measurement of, 356 

 of gases, 158, 348 

 of liquids, 158, 349 

 specific, 348 

 Retardation of currents through 



cables, 274, 296, 430 

 Retentivity (magnetic), 90, 313 

 Return shock or stroke, 26, 304 

 Reymond, Dii Bois, his galvanometer, 



231 



on animal electricity, 231 

 unpolarisable electrodes, 231 

 Rheocord, 356 

 Rheostat, 356 

 Rheometer, \ 



Rheoscope, > see footnote to 197 

 Rheotrope, ) 



Riess, Peter, on electric distribution, 

 35 



Riess, Peter, on length of spark, 291 

 electric thermometer, 288 {foot- 

 note) 



Ritchie's electromotor, 375 

 Ritter, Johann Wilhelm, on action 



of current on sight, 228 

 his secondary pile, 415 

 on subjective galvanic sounds, 



230 

 on the sensitive plant (Mimosa), 



230 



Rolling friction, 10 

 Romagnesi, Dr., discovers magnetic 



action of current, 184 

 Romas, De, his electric kite, 302 

 Ronalds, Sir Francis, invented a 



telegraph, 423 

 Rotations, electromagnetic, 335 



Arago's, 401 



Rowland, Harry A ., on magnetic 

 effect of electric convection, 337 

 on intensity of magnetisation, 



3 J 3 



Rnhmkorff's induction coil, 398 

 commutator, 399 

 electromagnet, 339 



S 



St. Elmo's fire, 302 (footnote) 



Salts, electrolysis of, 417 



Sanderson, J. Burdon, on electric 

 sensitiveness of carnivorous plants, 

 231 



Sawdust battery, 158, 176 



SchiveiggeSs multiplier, 189 



Secondary batteries, 178, 415 



Secular variations of magnetic ele- 

 ments, 141 



SeebecKs discovery of thermo-elec- 

 tricity, 379 



Selenium, photo-voltaic properties of, 



Self-induction of circuit, 404 

 Self-record ing apparatus, 146, 288, 307 

 Self-repulsion of current, 334 

 Sensitive plant, behaviour of, 230 

 Series, union of cells in, 171 

 Shadows, electric, 293 

 Sheet conductor, flow of electricity 



in, 354 



Shell, magnetic (see Magnetic Shell) 

 Shock, electric, 226 



of current, 226 



"Short-coil" instruments, 352 

 Shunt, 202 

 Siemens, Carl Wilhelm^ on heating 



effect in Leyden jar, 272 



