Tables 301, 302. 

 DEMAGNETIZING FACTORS FOR RODS. 



TABLE 301. 



289 



H^ true intensity o» magnetizing field, H' = intensity of applied field, /= in- 

 tensity of magnetization, H^H' — NI. 



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 

 {=//-i-4-ir /) less than loooo, A' is approximately constant; using a solenoid 

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

 values for yV^ 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. 



r". R. Mann, Physical Review, 3, p. 359; 1896. 



H. DuBois, Wied. Ann. 7, p. 942 ; 1902. 



C, L. B. Shuddemagen, Proc. Am. Acad. Arts and Sci. 43, p. 185, 1907 (Bibliography). 



TABLE 302. 



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



and //=//'— A'B. 



Smithsonian Tables. 



