TABLE 472. 



375 



DISSIPATION OF ENERGY IN THE CYCLIC MAGNETIZATION OF VARIOUS 



SUBSTANCES. 



C. P. Steinmetz concludes from his experiments* that the dissipation of energy due to 

 hysteresis in magnetic metals can be expressed by the formula e = aB lA , where e is the energy 

 dissipated and a a constant. He also concludes that the dissipation is the same for the same 

 range of induction, no matter what the absolute value of the terminal inductions may be. His 

 experiments show this to be nearly true when the induction does not exceed j- 1 5000 c. g. 8. 

 units per sq. cm. It is possible that, if metallic induction only be taken, this may be true up to 

 saturation ; but it is not likely to be found to hold for total inductions much above the satura- 

 tion value of the metal. The law of variation of dissipation with induction range in the cycle, 

 stated in the above formula, is also subject to verification.! 



Values of Constant a. 



The following table gives the values of the constant a as found by Steinmetz for a number of different specimens. 

 The data are taken from his second paper. 



* " Trans. Am. Inst. Elect. Eng." January and September, 1892. 

 t See T. Gray, " Proc. Roy. Soc." vol. Ivi. 



SMITHSONIAN TABLES. 



