Abstract
The expansion theorem of Heaviside is applied to the solution of the problem in which a cable, having been charged until it reaches its steady state, is insulated at the sending end; and the potential is required at any point and at any time after insulation. It is found that at the sending end there is an initial steep fall of potential which is due to a part of the charge being drained away from this end, in order to equalize the potential throughout the line when the exciting source has been removed. After the potential has become uniformly distributed, it falls with time according to a simple exponential law.
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