INDEX 



345 



Thomson's trap door electrometer, 91 

 Townsend's experiment on susceptibility 



and permeability, 293 

 Tubes of force in electric field, 32: 

 of force in magnetic field, 217 

 of force, properties of. 34-36 

 of strain, transference from one 

 charge to another, 56 



UNIT magnetic pole, 210 

 Units of electrification, 28, 32 



VECTOR resolution of a small magnet, 220 

 Verdet's constant, 322 



constant, effect of temperature on, 



323 



Vibration, time of, of a needle with small 

 susceptibility, 260 



Villari reversal, 190 



Voigt's experiments in pyroelectricity, 



153 

 theory of pyro- and piezoelectricity, 



156 



theory of the Faraday rotation, 329 

 Vitreous, or positive, electrification, 2 



WATER, specific inductive capacity of, 



129 



Weber's theory of magnetisation, 194 

 Wills' experiments in susceptibility and 



permeability, 292 

 Wimshurst machine, 18 

 Winter's plate machine, 11 

 ring, 12 



ZEEMAN effect, 336 



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