Abridgment of law of magnetization

The purpose of the study which constitutes the subject matter of this paper was to investigate the reliability of Frolich's law of magnetization near saturation. For the last forty years, Frolich's law has been accepted as the most reliable expression representing the relation of magnetizing force to the magnetic induction produced thereby in ferromagnetic materials. In the course of the study it was found that the law is not as reliable as it is generally believed to be, particularly for purpose of computation of saturation value. It was also found in the course of the same study that this part of the curve follows the law,
$B-H = S (1-b e^{-aH})$
… (equation 30–2) more closely than any other law yet formulated. This law and Frolich's law are both in harmony with Weber's theory of molecular orientation. (See equations 24, 25, 26).