The calculation of waveform distortion in iron-cored audio-frequency transformers

In the design of transformers, the prediction of the amount of waveform distortion from a knowledge of the properties of the core material becomes complicated if the preceding circuit has a high impedance. A theorem is given showing that, if suitable distortion and other measurements are made on a sample core of the material to be used and the distortion factor plotted as a function of two suitably chosen variables, then this information is sufficient to enable the distortion arising from any transformer in any resistive circuit to be calculated exactly.