Tables 553-556 465 



TABLE 553. — Magnetic Properties of Two Types of American Magnet Steel 



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



Values of B 



Tungsten steel . 

 Chrome steel. . . 



35° 



57 



34-5 

 58 



53-3 



75 



49.0 

 82 



63.3 

 95 



63-5 

 95 



72 .0 

 iti 



143 



70 



109 

 no 



270 

 45 



200 

 70 



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: ffmax 200 Bma.x 14,000 Chrome steel: flmas 200 Bmax 11.050 

 E e 62.5 B r 10,400 E e 45.7 B r 7,030 



TABLE 554. — Magnetic Properties of a Ferro-Cobalt Alloy, Fe 2 Co (35% Cobalt) 

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



As received f 15,000 f 22.9 [7750 f 3.79 



Annealed at 1000° C Bmax I 15,000 ffmax 18.3 B r < 7460 E c \ 3.95 

 Quenched from 1 000 C (15,000 1 130 [ 8240 I.I4-3 



TABLE 555. — Magnetic Properties of a Ring Sample of Transformer Steel 

 in Very Weak Fields 



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



Values of E 

 Values of B 

 Values of ju. 



.001 

 = ■45 

 450 



0.002 



0.91 



45S 



0.004 

 I.85 

 462 



0.006 

 2.87 

 478 



3.008 



3-94 



492 



3. OIO 



5°S 

 SOS 



0.012 

 6.30 



525 



0.014 



7-5i 



536 



0.018 



10.19 



566 



0.020 



11.64 



S82 



TABLE 556. — 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 E and for a finite range increases in simple proportion to E. He gives the formula k = 15 + 100E, or / = i$E 

 + iooff 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 anneal?d give k = 6.4 -f- 5. iff , or / = 6.4-ff + 5. iff 2 . The 

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



Smithsonian Tables. 



