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CONTENTS.
xix
Mechanical Action between Electrified Bodies.
Art.
Page
103. Comparison of the force between different electrified systems
119
104. Mechanical action on an element of an electrified surface
121
105. Comparison between theories of direct action and theories of stress
122
106. The kind of stress required to account for the phenomenon
123
107. The hypothesis of stress considered as a step in electrical science
126
108. The hypothesis of stress shewn to account for the equilibrium of the medium and for the forces acting between electrified bodies
128
109. Statements of Faraday relative to the longitudinal tension and lateral pressure of the lines of force
131
110. Objections to stress in a fluid considered
131
111. Statement of the theory of electric polarization
132
Points and Lines of Equilibrium.
112. Conditions of a point of equilibrium
135
113. Number of points of equilibrium
136
114. At a point or line of equilibrium there is a conical point or a line of self-intersection of the equipotential surface
137
115. Angles at which an equipotential surface intersects itself
138
116. The equilibrium of an electrified body cannot be stable
139
Forms of Equipotential Surfaces and Lines of Flow.
117. Practical importance of a knowledge of these forms in simple cases
142
118. Two electrified points, ratio . (Fig. I)
143
119. Two electrified points, ratio . (Fig. II)
144
120. An electrified point in a uniform field of force. (Fig. III)
145
121. Three electrified points. Two spherical equipotential surfaces. (Fig. IV)
145
122. Faraday's use of the conception of lines of force
146
123. Method employed in drawing the diagrams
147
