288 Tables 298-300. MAGNETIC PROPERTIES OF IRON. 



TABLE 298. — Magnetic Properties of Iron and SteeL 



£. Gumlich, Zs. ftir Electrochemie, 15, p. 599; 1909. 

 Brackttt indicate annealing at 800° C in vacuum. Partntheses indicate hardening by quenching from cherry-red. 



TABLE 299. — Oast Iron In Intense Fields. 



B. O. Peirce, Proc. Am. Acad. 44, 1909. 



TABLE 300. — Corrections for Ring Specimens. 

 In the case of ring specimens, the average magnetizing force is not the value at the mean radius, 

 the ratio of the two being given in the table. The flux density consequently is not uniform, and 

 the measured hysteresis is less than it would be for a uniform distribution. This ratio is also given 

 for the case of constant permeability, the values being applicable for magnetizations in the neigh- 

 borhood of the maximum permeability. For higher magnetizations the flux density is more uni. 

 form, for lower it is less, and the correction greater. 



Smithsonian Tables. 



M. G. Lloyd, Bull. Bur. Standards, 5, p. 425; 1908. 



