374 TABLES 47O-471. 



DEMAGNETIZING FACTORS FOR RODS. 



TABLE 470. 



ff= true intensity o* magnetizing field, H' = intensity of applied field, /= in- 

 tensity of magnetization, H=H' .AY. 



Shuddemagen says : The demagnetizing factor is not a constant, falling for 

 highest values of /to about 1/7 the value when unsaturated; for values of B 

 (=^H~4ir/) less than 10000, N is approximately constant; using a solenoid 

 wound on an insulating tube, or a tube of split brass, the reversal method gives 

 values for TV which are considerably lower than those given by the step-by-step 

 method ; if the solenoid is wound on a thick brass tube, the two methods prac- 

 tically agree. 



C. R. Mann, Physical Review, 3, p. 359; 1896. 



H. DuBois, Wied. Ann. 7, p. 942 ; 1002. 



C. L. B. Shuddemagen, Proc. Am. Acad. Arts and Sci. 43, 



p. 185, 1907 (Bibliography). 



TABLE 471. 



Shuddemagen also gives the following, where B is determined by the step method 



and/f=//' KB. 



SMITHSONIAN TABLES. 



