INDEX OF SUBJECTS. 645 



PART II. ELECTRICAL CURRENTS. 



CHAPTER L PROPAGATION OF ELECTRICITY IN 

 THE PERMANENT STATE. 



PAGE 



Permanent Condition 186 



Analogy with Thermal Phenomena 186 



Ohm's Theory 187 



Kirchhoff's Hypothesis 188 



Superposition of Permanent States 188 



In the Permanent State the Density in the Interior of a Conductor is Null 189 



Linear Conductors. Ohm's Law 190 



The Resistance of a Conductor is the Inverse of a Velocity 191 



Physical Meaning of this Velocity 192 



Any Given Linear Conductors 193 



Kirchhoff's Laws 194 



Resistance of a Multiple Conductor 195 



Heterogeneous Linear Conductors 196 



Case in which the Circuit contains Electromotive Forces ../... 198 



Conductors of any Given Form. Electrodes 199 



Heterogeneous Conductors 2OI 



Anisotropic Conductors 202 



Conductors in Two Dimensions 204 



Resistance of a Conductor of any Given Form 206 



Distribution of Electricity on Linear Conductors 207 



Propagation in a Wire when there is a Loss on the Surface 208 



Resistance of a Conductor where there is a Loss by the Sides .... 210 



CHAPTER II. VARIABLE STATE. 



Application of Fourier's Formulas 213 



Variable State in a Cylindrical Conductor 214 



Duration of the Relative Propagation 216 



Unlimited Wire 216 



Momentary Contacts 220 



Electrical Wave 221 



Wire of Finite Length 227 



Momentary Contacts 230 



Use of Condensers 232 



Propagation in Dielectrics 232 



Residual Charge of Condensers 233 



