Abstract
A classical theory of magnetic charge is formulated on the basis of an action principle. It is an extension of Schwinger's quantum theory of magnetic charge to the classical level. The action integral is defined by limiting procedure to ensure the equivalence of all singularity lines. The action principle gives correct equations of motion for the particles, Maxwell's equations, and the conservation laws of the Lorentz group. The consistency of the theory demands a charge-quantization condition, and the existence of a constant with the dimensions of action.

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