Hysteresis and Eddy-Current Losses in Iron at Radio Frequencies

After reviewing the bibliography of heat losses per cycle at various frequencies, the author describes a comparison calorimnetic method whereby the losses in the soft iron wire core of a toroid are measured (against a similarly wound toroid without an iron core). The Chaffee gap radio frequency generator is used. Braun tube oscillograms of the cycle are shown, together with experimental data on the iron losses. It is found that the loss per cycle decreases as the frequency increases.