Table 374. 

 ENERGY LOSSES IN TRANSFORMER STEELS. 



O^O 



Determined by the wattmeter method. 



Loss per cycle per cc^=^ AB'-^-hnB", where /? = flux density in gausses and « = frequency m 



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



and/ the same for eddy currents. 



• German. 



t English. 



X 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. 4S3 ; 1909. 



Note. —For fonnula and tables lor tbe calculation of mntnal and self inductance see Bulletin Bureau 

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



Smithsonian Tablcs. 



