This paper is concerned with the experimental and theoretical problems of measuring the saturation magnetic moment per gram of various magnetic materials. A five-string pendulum magnetometer is used and the sample is located in a non-homogeneous field. This method is basically the same as that described by G. N. Rathenau and J. L. Snoek in Philips Research Reports, 1, 239, 1946. However, in the present report a description and pictures of a practi¬cal operating system (including automatic timing) are shown. Sources of possible error are pointed out, togetb.er with the methods of suppressing them, which enabled us to limit our error to a maximum of 3 per cent. Furthermore, equations are derived showing the exact effect of using simply shaped pole caps, e.g., spherical, instead of hopefully assuming that all will be well if one limits operation to a small region near the center of the pole gap.
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