# Page:A Treatise on Electricity and Magnetism - Volume 1.djvu/25

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Chapter V.

Mechanical Action between Electrified Bodies.

Art.

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

Chapter VI.

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

Chapter VII.

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 $4:1$. (Fig. I)

119. Two electrified points, ratio $4:-1$. (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