90 BELL SYSTEM TECHNICAL JOURNAL 



Recent Summarizing Articles 



5. "Theorie der Elektricitat," R. Becker. Teubner, Leipzig, chap. 4, v. 2, 1933. 



6. "Magnetisms," R. Becker and R. LandshofF, Die Physik, 3, No. 2, 1935, p. 



100-8. 



7. "Handbuch der Radiologic," F. Bloch. Akad. Verlag., Leipzig, 2d ed., v. 6, 



pt. 2, 1934, p. 604. 



8. "Handbuch der Physik" (Geiger u. Scheel), H. Bethe. Springer, Berh'n, 2d ed., 



V. 24, pt. 2, 1933, p. 585. 



9. "Stand der Forschung und Entwicklung auf dem Gebiet der ferromagnetischen 



Werkstoflfe," A. Kussmann. Archiv. fiir Elektrotechnik, 29, May 1935, p. 

 297-32. 

 10. "Magnetic Materials," W. C. Ellis and E. E. Schumacher. Metals and Alloys, 

 5, Dec. 1934, p. 269-74, and 6, Jan. 1935, p. 26-9. 



Original Sources 



1 1 "The Magnetic Properties of Some Iron Alloys Melted in Vacuo," T. D. Vensen. 

 A. I. E. E. Trans., 34, 1915, p. 2601-41. 



12. "New High Permeabilities in Hydrogen Treated Iron," P. P. Cioffi. Phys. Rev., 



45, May 15, 1934, p. 742; and unpublished data. 



13. These are without additions of other elements except for deoxidation. With 



additions of copper and molybdenum, material with initial permeability as 

 high as 40,000 has been reported by H. Neumann. Arch. f. tech. Mess., 4, 

 Dec. 1934, T-168. 



14. "The Magnetic and Electrical Properties of the Iron-Nickel Alloys," C. F. 



Burgess and J. Aston. Met. and Chem. Engg., 8, Jan. 1910, p. 23-6. 



15. "Heat Treatment of Magnetic Materials in a Magnetic Field," J. F. Dillinger 



and R. M. Bozorth. Physics, 6, Sept. 1935,_ p. 279-91. See also earlier 

 paper "Permeability Changes in Ferromagnetic Materials Heat Treated in 

 Magnetic Fields," G. A. Kelsall. Physics, 5, July 1934, p. 169-72. 



16. G. Panebianco, Rend. d. Napoli, 16, 1910, p. 216. 



17. "Permalloy, an Alloy of Remarkable Magnetic Properties," H. D. Arnold and 



G. W. Elmen. Franklin Inst. Jour., 195, May 1923, p. 621-32. 



18. "Magnetic Properties of Perminvar," G. W. Elmen. Franklin Inst. Jour., 206, 



Sept. 1928, p. 317-38. 



19. "Saturation Value of the Intensity of Magnetization and the Theory of the 



Hysteresis Loop," E. H. Williams. Phys. Rev., 6, Nov. 1915, p. 404-9. 



20. "The Iron Cobalt Alloy, FejCo, and Its Magnetic Properties," T. D. Yensen. 



Gen. Elec. Rev., 19, Sept. 1915, p. 881-7. 



21. "New K. S. Permanent Magnetic" (in English), K. Honda, H. Masumoto, and 



Y. Shirakawa. Science Rep., Tohoku Imp. Univ., 23, 1934, p. 365-73. 



22. S. J. Barnett, Rev. Mod. Phvsics, 7, 1934, p. 129. 



23. "Atomic Shielding Constants," J. C. Slater. Phys. Rev., 36, July 1930, p. 57-64. 



See also ref. 8. 



24. "Zur Theorie des Ferromagnetismus," W. Heisenberg. Zeit. Physik, 49, July 



1928, p. 619-36. 



25. In a recent paper G. Urbain, P. Weiss and F. Trombe, Compt. Rend., 200, 1935, 



p. 2132, report that the rare-earth metal gadolinium is ferromagnetic. For 

 this substance in the metallic state Djd is about 3, in accordance with Slater's 

 rule (see Fig. 3). This usually high value of Djd indicates that gadolinium 

 should have a low Curie point, which in fact is observed to be 16 degrees 

 centigrade. 



26. "Barkhausen Effect, II. — Determination of the Average Size of the Discon- 



tinuities in Magnetization," R. M. Bozorth and J. F. Dillinger. Phys. Rev., 

 35, April 1, 1930, p. 733-52. 



27. "Zur Theorie der Magnetisierungskurve von Einkristrallen," N. S. Akulov. 



Zeit. Physik, 67, 1931, p. 794. See also "A Contribution to the Theory of 

 Ferromagnetic Crystals," G. Mahajani. Phil. Trans. Roy. Soc, 228A, 1929, 

 p. 63-114, and reference 5. 



28. Here the ordinates are B-H instead of the more usual B, since the former ap- 



proaches a limiting "saturation" value. B-H sometimes is referred to as 

 "ferric induction." 



