62 BELL SYSTEM TECHNICAL JOURNAL 



Rce Eddy current resistance of copper winding. 



Re Eddy current resistance due to core. 



Rh Hysteresis resistance due to core. 



Rfm Resistance due to core only, corresponding to Lfm. 



Roha. Total resistance corresponding to Lobs.. 



Ai? Resistance due to core and leakance only. 



p Resistivity of core material; abohm-cm. 



Pi Ditto; microhm-cm. 



/ Thickness of sheet, diameter of wire, or r.m.s. sphere diameter 



of magnetic material ; cm. 



d Eddy current parameter; = 2irt^fxof!p for sheet material, 



W Hysteresis energy dissipated per cycle per cubic centimeter of 



core; erg. 



