A determination of the magnetic saturation induction of iron at room temperature

Abstract

A determination of the magnetic saturation induction of iron at r00111 temperature has been made, using a modification of the Ewing isthmus method. Specimens were taken from several ingots of iron of exceptional purity prepared at th e National Bureau of Standards. Corrections were made for the effect of the small amounts of impurities present, and care was taken to minimize systematic and accidental errors. The value found for pure iron at 25° C, assuming a density of 7.874 glcm 3, is 21.58 ± 0.01 kilogauss. CONTENTS Page. I. Introduction___ ___________ ______________________________ ____ ___ 1 II. Previous determinations_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 2 III. Method and apparatus____ _____ _________________ __ ___ __ _____ ____ 2 IV. Calibration and adjustment__ ____ ________________________________ 4 V. Tes t specimens _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 7 VI. Final observations and results_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 9 VII. References__ __ _______ ______ ____ _______________ _______________ __ 12