376 



TABLE 473. 

 ENERGY LOSSES IN TRANSFORMER STEELS. 



Determined by the wattmeter method. 



Loss per cycle per cc = AB* -\-lni B'J, where B = flux density in gausses and n = frequency in 



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



and^y 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. 29), assuming the loss proportional to the thickness. 



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



Note. -For formula and tables for the calculation of mutual and self inductance see Bulletin Bureau 

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



SMITHSONIAN TABLES. 



