438 



INDEX. 



Galvani, Aioysius, on preparation of 



frog's limbs, 229 

 on Animal Electricity, 231 

 Galvanic Batteries (see Voltaic 



Batteries) 



Electricity (see Current Elec- 

 tricity] 

 Taste, 227 



Galvanism (see Current Electricity) 

 Galvanometer, 107 

 absolute, 200 

 astatic, 198, 231 

 ballistic, 204 

 constant of, 200 

 differential, 203 

 Du Bois Reymond's, 231 

 Helmholtz's, 199 

 reflecting (Sir W. Thomson's), 



or mirror, 202 

 sine, 201 

 tangent, 199 



Galvanoplastic (see Electrotyping) 

 Galvanoscope, 188 

 Gas Battery, 416 

 Gases, resistance of, 158 

 Gassiot, J. P., on strise, 294, 300 

 Gaugain, Jean Mothfa, discharging 



electroscope, 259 

 on Pyroelectricity, 66 

 Tangent Galvanometer, 199 

 Gauss, F., invented absolute measure- 

 ment, 32$a 

 magnetic moment of earth, 



3250 



magnetic observations, 313 

 Gay, Lussac, on atmospheric elec- 

 tricity, 307 

 Geissler's tubes, 291 

 Gernez on electric distillation, 223 

 Gibson and Barclay on dielectric 



capacity of paraffin, 270 

 Gilbert, Dr. William, 'discovers 



electrics, i 

 discovered magnetic reaction, 



83 

 discovers that the earth is a 



magnet, 88, 135 

 heat destroys magnetism, 99 

 his balanced - needle electro- 

 scope, 12 



observation of moisture, 9 

 observations on magnets, 78 

 on de - electrifying power of 



flame, 291 



on magnetic figures, 108 

 on magnetic substances, 85 

 on magnetic permeability, 84 

 on methods of magnetisation, 

 96, 97 



Gilding by Electricity, 431 

 Globular lightning, 304 

 Glow Discharge, 290, 302 (footnote} 

 Glowing of wires, 369 

 Gold-leaf Electroscope (see Electro- 

 scope) 

 Gordon, f. E. H., on magneto-optic 



rotatory power, 387 

 on dielectric capacity, 270, 271 

 on length of spark, 291 

 Gramme's dynamo-electric machine, 



410 



Gravitation Battery, 176 

 Gray, Stephen, discovers conduction, 



27 



on lightning, 302 

 Grottkuss' theory, 160, 418 

 Grove, Sir William R., his Gas 



Battery, 416 

 Grove's Battery, 171 

 magnetic experiment, 113 

 on electric property of Flame, 



Guard-ring, Guard-plate, 248, 261 

 Guericke, Otto von, discovered elec- 

 tric repulsion, 3 

 invents electric machine, 38 

 observes electric sparks, 9 

 Gunpowder fired by electricity, 286, 



288, 370 

 Gymnotus (electric eel), 68, 218 



Halts phenomenon, 337 



Hankel's electroscope, 264 



Harris, Sir W. Snow, his unit 



Leyden jar, 259 

 attracted - disc electrometer, 



261 



on length of spark, 291 

 Heat, effect of, on magnets, 99, 100 

 ,, batteries, 183 



conductivity, 349 



Heating effects of currents, 171, 366, 



380 



due to magnetisation, 113, 4or 

 effect of sparks, 288 



,, dielectric stress, 272 

 local, at electrodes, 417 

 Helmholtz, Hermann L. F., on 

 effect of current on sight, 228 

 Electrolytic convection, 418 

 Equations of Self-induction, 



405 



Galvanometer, 199 



Henry, Joseph, invented the 

 " sounder," 423 



