This only means that the equipotential surfaces are crowded together, just as they are near the ridge of a house.
Let S represent the sun, and the circle round it represent the equipotential spheres which exist round the sun.
When the lines of force and the equipotential surfaces are straight, parallel, and equidistant, we have a uniform field.
Hence the distances separating the equipotential surfaces are a measure of the electromotive force present.
In this way the equipotential lines can easily be picked out.
The germs of certain medusae seem to be equipotential in every respect, even in their cleavage stages.
This cambium, therefore, also deserves the name of an equipotential system.
Each ring represents an equipotential line in the field of diffusion.