PRESENT STATUS OF FERROMAGNETIC THEORY 91 



29. "Surface Magnetization in Ferromagnetic Crystals," L. W. McKeehan and 



\y. C. Elmore. Phys. Rev., 46, Aug. 1, 1934, p. 226-8, and private communica- 

 tion. See also the earlier experiments of L. v. Hamos and P. A. Thiessen, 

 "Uber die Sichtbarmachung von Bezirken verschiedenen ferromagnetischen 

 Zustandes fester Korper," Zeit. Phys., 75, 1932, p. 562, and "Experiments 

 on the Nature of Ferromagnetism," F. Bitter. Phys. Rev., 41, Aug. 15 

 1932, p. 507-15. 



30. "The Theory of the Ferromagnetic Anisotropy of Single Crystals," R. M. 



Bozorth. Phys. Rev., 42, Dec. 15, 1932, p. 882-9. 



31. "Anisotropie in magnetischen Werkstoffen," O. Dahl and F. Pfafifenberger. 



Zeil. Phys., 71, Aug. 1931, p. 93-105. 

 M. "Discussion on the Influence of Grain Size on Magnetic Properties," N. P 



Goss. Trans. A. S. Metals, 22, Dec. 1934, p. 1133-9. 

 ^3. "The Orientation of Crystals in Silicon Iron," R. M. Bozorth, Trans. A. S. 



Metals, 23, Dec. 1935, p. 1107-11. 



34. "Effect of Tension Upon Magnetization and Magnetic Hysteresis in Permalloy," 



O. E. Buckley and L. W. McKeehan. Phys. Rev., 26, Aug. 1925, p. 261-73. 



35. J. F. Dillinger and F. E. Haworth, unpublished data. 



36. " Dauermagnetwerkstoffe auf der Grundlage der Auscheidungshartung," W. 



. Koster. Stahl u. Eisen, 53, Aug. 17, 1933, p. 849-56. 



37. "Uber den Einfluss des elastischen Spannungszustandes auf die Grdsse der 



Anfangspermeabilitat," M. Kersten. Zeit. techn. Physik, 12, 1931, p. 665-9, 

 based on the earlier work "Zur Theorie der Magnetisierungskurve," R. 

 Becker. Zeit. Phys., 62, May 1930, p. 253-69. 



