"tube of force" instead of line of force, thereby indicating that the force is not limited to a particular mathematical line, but acts with equal strength in any point of the same transverse section of the tube.
Let us now apply the conception of lines, or tubes of force, to see what must happen if a non-charged conductor is approached to a charged conductor. In Fig. 2 the circle on
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Fig. 2.
the right represents a sphere charged with positive electricity. On the left is a cylinder with rounded ends containing no charge originally. Each tube of force emanating from the charged sphere has the property of pulling negative electricity towards the sphere and pushing positive electricity as far away from it as possible. These forces produce a separation of the two electricities originally combined on the non-charged cylinder, so that
