472 



Tables 573 and 574 

 TABLE 573. — Energy Losses in Transformer Steels 



Determined by the wattmeter method. 



Loss per cycle per cc — AB*-{-bnB y , where B = flux density in gausses and «= frequency in 



cycles per second, x shows the variation of hysteresis with B between 5000 and 10000 gausses, 



and^ the same for eddy currents. 



* German. t English. 



t In order to make a fair comparison, the eddy current loss has been computed for a thickness of 0.0357 cm (Gage 

 No. 2g), assuming the loss proportional to the thickness. 



Lloyd and Fisher, Bull. Bur. Standards, 5, p. 453 j 1909. 



Note. — For lorniulee and tables for the calculation of mutual and self inductance see Bulletin Bureau 

 of Standards, vol. 8, p. 1-237, 1912. 



TABLE 574. — Magnetic Properties of Permalloy 



(Yensen, Nickel-Iron Alloys, Journ. Franklin Inst., 199, 340, 1925; Arnold, Elmen, Permalloy, 

 loc. cit., 195, 621, 1923.) 



* Permalloy. 

 Smithsonian Tables 



