370 



TABLES 462-455. 



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 H are measured in cgs units. 



Percentage composition: Tungsten steel, 0.67 Ws.i Cr 2.09 Si 0.25 

 Chrome steel, C 0.81 W 0.96 Mn 0.38 Si 0.26 

 Tungsten steel: 77max 200 5max 14,000 Chrome steel: 77max 200 Z?max 11.050 



H e 62.5 B T 10,400 H e 45.7 B r 



TABLE 453. -Magnetic Properties of a Ferro-Cobalt Alloy, Fe 2 Co (35% Cobalt). 

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



As received 



Annealed at 1000 C 5max 



Quenched from 1000 C 



15,000 

 15,000 

 15,000 



22.9 



ZJmax \ 18.3 

 1 130. 



750 



B r \ 7460 

 8240 



[ 3.79 

 H e \ 3.95 

 (14. 3 



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 k = 15 + looF, or / = isH 

 + ioo77 2 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 k = 6.4 + S.iH, or / = 6.4# + S-iH*. The 

 forces were reduced as low as 0.00004 cgs, the relation of k to H remaining constant. 



SMITHSONIAN TABLES. 



