INDEX. 



445 



Thomson, Sir ' IVilliam, Proof of 



Contact Electricity, 71 

 Attracted - disc Electrometers, 



261 



Divided-ring Electrometer, 71 

 Electric convection of Heat 

 (the " Thomson-effect"), 383 

 Mirror Galvanometer, 202, 431 

 Modified Z>tf#zV//'.y Battery, 176 

 on atmospheric electricity, 306 

 on Electric Images, 250 

 on length of spark, 291 

 on nomenclature of Magnet 



Poles, 8 1 (footnote) 

 - on sounds in condensers, 272 

 predicts electric oscillations, 



295 (footnote) 

 Quadrant Electrometer, 262 

 Siphon Recorder, 431 

 Thermo-electric Diagram, 383 

 Water-dropping Collector, 307 

 Thunder, 9, 304 

 Thunderstorms, 302 



Theory of, 303 

 Tinfoil Condensers, 47, 275 

 Tongs, Discharging-, 51 

 Torpedo (electric fish), 68, 218 

 Torpedoes, fuzes for firing, 286, 370 

 Torsion affected by magnetisation, 113 

 Torsion Balance, or ) (Coulomb's) 

 Torsion Electrometer f 15, 119 

 Total action of magnet, 3253. 

 Tourmaline, 66, 297, 390 (footnote) 

 Transmission of Power by Electricity, 



376 



Tubes of force, 243, 311 

 Two-fluid cells, 170 

 Two-fluid theory, 6 

 Two -kinds of Electrification, 4, 5 

 ,, Magnetic poles, 81 

 Tyndall, John, on diamagnetic polar- 

 ity, 342 

 on magne-crystalhc action, 343 



UNIT Jar, 259 



Unit (Electrostatic) of Electricity, 17, 



236 



(Electrostatic) of Capacity, 247 

 Magnetic Pole, 125 

 of difference of potential, 242 



322, 323 



of Electromotive-force, 322, 323 

 of Resistance, 322, 323 

 of Strength of Current, 196, 



Units, Fundamental and Derived, 



254, 255 



dimensions of, 258, 324 

 Electrical (Electrostatic), 257 

 Electromagnetic, 322, 323 



Magnetic, 321 

 Di 



3245 



Physical Dimensions 



of, 258, 



Practical, 323 



Universal Discharger, 54 



Ure t Dr., on Animal Electricity, 229 



"v t n values^of, 365, 390 



Vacuum, induction takes place 



through, 56, 84, 89 

 partial, spark in, 9, 292 

 spark will not pass through, 



291 



Vacuum-tabes, 292 

 ' ' Variation," the (see Declination) 

 Variation of Declination and Dip, 

 secular, 141 ; annual, 143 ; diurnal, 

 142 ; geographical, 136 

 Varley, C. f., his Telephone, 272 

 Vegetables, Electricity of, 69 



carnivorous, sensitiveness of, 



230 

 Velocity of Discharge, 296 



of Electricity (alleged), 296 

 of Light, 365, 390 

 Verdetjs Constant, 387 

 Vibration produces Electrification, 50 

 Vitreous electricity, 4 

 Volt, the, 323 

 Volta,Alessandro, his Electrophorus, 



22 



Condensing Electroscope, 71, 

 149 



Contact Series, 72 



Crown of Cups, 151 



on Atmospheric Electricity, 307 



on Contact Electricity, 71, 148 



on Electric Expansion, 273 



on Electrification due to com- 

 bustion, 62 



Subjective Sounds due to 

 Current, 228 



Voltcts Law, 72, 148, 156 



Voltaic Pile, 150 



Voltaic Electricity (see Current Elec- 

 tricity) 



Arc, 371 



Battery, 154, 167 



Cell, simple, 152 . 



Pile, 150 

 Voltameter, 214, 215, 216 



' 



UNIVK 



