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The two-reaction theory of synchronous generators yields only qualitative results when applied to homopolar machines under load. Saturation has to be considered for more exact results. The method developed in two companion papers is used to find the airgap radial induction when the armature carries purely reactive balanced currents. The additional boundary conditions are explained and a computer program established. Numerical results were obtained for a 95 kvs. 115/200 volts, 3,300 cps, 40,800 rpm alternator. The results are shown in curves.