INDEX. 



433 



INDEX. 



N.B. The Figures refer to the Numbered Paragraphs. 



ABSOLUTE Electrometer, 261 

 Galvanometer, 200 

 Measurements, 325^ 363, 364 

 Units of Measurement, 255 



Accumulator, 47, 48, 266 



of currents (see Secondary 

 Batteries) 



Action at a distance, 21, 56, 272 



Air condenser, 48, 267 



Air, resistance of, 291, 325!} 



Aldini, Giovanni, Experiments on 

 Animals, 229 



Amalgam, electric, 41 



Amalgamating zinc plates, 162 



Amber, i 



Amoeba, the, electrical sensitiveness 

 of, 230 



Ampere, Andre, Theory of Electro- 

 dynamics, 331, 334 

 "Amptris'B&e* 186 

 Laws of Currents, 332 

 suggests a Needle Telegraph, 



4 2 3 



Table for Experiments, 333 

 Theory of Magnetism, 338 



Angles, Ways of Reckoning, 129 

 Solid, 133 



Animal Electricity, 68, 231 



Anion, 210 



Annual variations of magnet, 143 



Anode, 207 



Arc, voltaic, 371 



Arago, Franfois Jean, 



classification of lightning, 304 

 magnetisation by current, 326 

 on magnetic action of a voltaic 



current, 191 

 on magnetic rotations, 401 



2 



Armature of magnet, 101 



of dynamo - electric machine, 



407, 409, 410 



Armstrong', Sir IVnt., his Hydro- 

 electric Machine, 44 

 Astatic magnetic needles, 190 



Galvanometer, 190 



Atmospheric Electricity, 64, 301, 306 

 Attracted-disc Electrometers, 261 

 Attraction and repulsion of elec- 

 trified bodies, i, 3, 18, 20, 

 66, 236 



and repulsion of currents, 331, 

 and repulsion of magnets, 76, 80 



332 



Aurora, the, 144, 145, 309 

 Ayrton (W. E.) and Perry (John) 

 on contact electricity, 72 

 on dielectric capacity of gases, 



271 



value of <( v," 365 

 Azimuth Compass, 134, 136 



B. A. UNIT (or ohm), 323, 363, 364 



Back Stroke, 26, 304 



Bain's Chemical Writing Telegraph, 



218 



Balance, Wkeatstone's, 358 

 Ballistic Galvanometer, 204 

 Bancalarion diamagnetism of flames, 



344 



Battery of Leyden Jars, 54 

 Batteries, voltaic, 154, 167, 182 



list of, 178 

 secondary, 415 

 Beccaria, Fattier G-, on electric 



distillation, 223 

 F 



