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<p>It is known that the iron loss in a static transformer is dependent upon the wave-form of the applied e.m.f., and G. Roessler has shown experimentally that when the same effective value of the e.m.f. is applied to a transformer the iron losses are less when the e.m.f. wave is peaked. The present paper has been prepared with a view to a more through treatment of the question. The author assumes the iron losses to be given by the expression alpha /b n/ B/sup 1.6/  beta /b f///sup 2//b n//sup 2/B/sup 2/, in which alpha and beta are constants, /b n/ is the frequency, /b f/ the form factor of the induced e.m.f., and B the max. flux-density in the iron. Th
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<br>Subjects: transformers, rotary converters and boosters; alternating-current research/ B8300 Power apparatus and electric machines</div>
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