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A method of virtual displacements is developed for obtaining the transient behavior of electrical systems with distributed constants. This method involves the association of a number of assumed "current modes" with generalized co-ordinates, and gives a set of equations which duplicates the mesh equations of a corresponding equivalent lumped network. The procedure developed is applicable to many different types of problems. Here, however, it is applied to the pulse transformer, the result being equivalent networks and procedures for calculating the constants in these networks.