642 INDEX OF SUBJECTS. 



PAGE 



Tubes of Force 24 



Coulomb's Theorem 25 



Corresponding Elements 25 



Uniform Field 26 



Electrified Surface separating Two Dielectrics 26 



Electrostatic Pressure 28 



Consequences of the Distribution of Electricity on the Surface of Conductors 30 



Actions of Spherical Layers 32 



Action of a Sphere consisting of Homogeneous Layers 34 



CHAPTER III GENERAL THEOREMS. 



Emission and Absorption of Force by Electrical Masses 36 



The Potential can neither have a Maximum nor a Minimum outside the 



Acting Masses 36 



Singular Points of Equipotential Surfaces 37 



Points and Lines of Equilibrium 38 



There is only One State of Equilibrium 40 



Theorems relating to Closed Surfaces 41 



Faraday's Law 44 



Gauss' Theorem 46 



M. Bertrand's Corollaries to Gauss' Theorem 46 



Earnshaw's Theorem 47 



CHAPTER IV. ELECTRICAL EQUILIBRIUM. 



Conditions of the Equilibrium of Conductors 51 



General Observations 52 



Relation of Charges to Potentials 53 



Analogies of the Problem of Electrical Equilibrium 55 



Electrical Capacity 59 



Sphere 59 



Ellipsoid 60 



Power of Points 62 



Circular Plate 63 



Concentric Spheres 63 



Condensers 65 



Leyden Jar 65 



Concentric Cylinders 67 



Capacity of Telegraph Cables 69 



Plane Condensers 69 



Capacity of a System of Conductors 7 1 



Batteries 71 



Charge by Cascade 7 2 



Reciprocal Influence of Two Insulated Conductors. Murphy's Method . . 74 



Reciprocal Action of Two Electrified Conductors 75 



