Mechanical Action between Electrified Bodies.
103. Comparison of the force between different electrified systems
104. Mechanical action on an element of an electrified surface
105. Comparison between theories of direct action and theories of stress
106. The kind of stress required to account for the phenomenon
107. The hypothesis of stress considered as a step in electrical science
108. The hypothesis of stress shewn to account for the equilibrium of the medium and for the forces acting between electrified bodies
109. Statements of Faraday relative to the longitudinal tension and lateral pressure of the lines of force
110. Objections to stress in a fluid considered
111. Statement of the theory of electric polarization
Points and Lines of Equilibrium.
112. Conditions of a point of equilibrium
113. Number of points of equilibrium
114. At a point or line of equilibrium there is a conical point or a line of self-intersection of the equipotential surface
115. Angles at which an equipotential surface intersects itself
116. The equilibrium of an electrified body cannot be stable
Forms of Equipotential Surfaces and Lines of Flow.
117. Practical importance of a knowledge of these forms in simple cases
118. Two electrified points, ratio . (Fig. I)
119. Two electrified points, ratio . (Fig. II)
120. An electrified point in a uniform field of force. (Fig. III)
121. Three electrified points. Two spherical equipotential surfaces. (Fig. IV)
122. Faraday's use of the conception of lines of force
123. Method employed in drawing the diagrams