370 



Tables 4S2-455. 



MAGNETIC PROPERTIES OF IRONS AND STEELS- 



TABLE 452. — Magnetic Properties of Two Types of American Magnet Steel. 



From tests at the Bureau of Standards. B and n are measured in cgs units. 



Values of B 



Tungsten steel . 

 Chrome steel. . . 



35° 



57 



34- S 

 S8 



S3-3 

 75 



49.0 

 82 



6000 



63 -3 

 95 



63. S 

 9S 



8000 



72 .0 

 III 



83 -4 

 120 



143 

 70 



109 

 no 



270 



4S 



200 

 70 



16,000 



Percentage composition: Tungsten steel, C 0.67 W 5.1 Mn 038 Si 0.26 



Chrome steel, C 0.81 W 0.96 Cr 2.09 Si 0.25 

 Tungsten steel: Hmax 200 Bmax 14,000 Chrome steel: fl^max 200 Bmux 11,050 

 He 62. S B, 10,400 He 45 -7 B, 7,030 



TABLE 453. — Magnetic Properties of a Ferro-Cobalt Alloy, FezCo (36% Cobalt). 

 From tests at the Bureau of Standards. B and H are measured in cgs units. 



As received [ 13,000 



Annealed at 1000° C Bmax < 15,000 ffmax 

 Quenched from 1000° C 1. 15,000 



TABLE 454. — Magnetic Properties of a Ring Sample of Transformer Steel 

 in Very Weak Fields. 



From tests made at the Bureau of Standards. B and H are measured in cgs units. 



TABLE 455. — Magnetic Properties of Iron in Very Weak Fields. 



The effect of very small magnetizing forces has been studied by C. Baur and by Lord Rayleigh. The following 

 short table is taken from Baur's paper, and is taken by him to indicate that the susceptibility is finite for zero values 

 of H and for a finite range increases in simple proportion to H. He gives the formula A = 15 + looH, or / = isB 

 + looH^ The experiments were made on an annealed ring of round bar 1.013 cms radius, the ring having a radius of 

 9.432 cms. Lord Rayleigh's results for an iron wire not annealed give * = 6.4 + 5. iff, or / = 6.4H + s.ifl'. The 

 forces were reduced as low as 0.00004 cgs, the relation of * to £f remaining constant. 



Smithsonian Tables. 



