PEIRCE. 



MAGNETIC PERMEABILITIES OF SOFT IRON. 



209 



I have found no other records of permeabilities so high as this.'' For 

 excitations above six gausses, however, the rings were distinctly less 

 permeable than good iron should be, and this anomalous behavior is 

 perhaps due to discontinuities across the lines of magnetization. 



TABLE I. 



Annealed Ring of Norway Iron (P), Axis parallel to the Axis of the Original Bar. 

 Measurements made by the Method of Ascending Reversals. 



' Stoletow, Ann. d. Physik, 146, 1872 (439); Riecke, Ann. d. Physik, 149, 

 1873; Rowland, Phil. Mag., 46, 1873 (140); Roessler, Inaugural Diss., Zurich, 

 1892; Holz, Ann. d. Physik, 8, 1876 (353); Ewing, Magnetic Induction in Iron 

 and Other Metals; Bauer, Ann. d. Physik, 11, 1880 (349); G. vom Hofe, Ann. 

 d. Physik, 37, 1889 (482); Lehmann, Ann. d. Physik, 48, 1893 (406); Benedicks, 

 Ann. d. Physik, 6, 1901; Lydall and PockUngton, Proc. Roy. Soc, 52, 1892; 



