It is of fundamental importance to be able to predetermine with as much numerical accuracy as possible, the phenomena which may take place in electrical systems. It is of importance first, because such predetermination, when possible, can be made at much less expense and trouble than is required to Obtain the same information experimentally; and second, because information so obtained Opens a way to new developments and improvements in the application of scientific knowledge. To predetermine in a numerical way what may happen in electrical systems under different conditions requires that the various phenomena be expressed in a mathematical form or the equivalent thereof. Of course it is not the mathematical expressions themselves which are of main interest, but these expressions are necessary since they afford the only means at our disposal, other than experimental investigation, by which the desired knowledge may be obtained.
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