TABLE 494.— DEMAGNETIZING FACTORS FOR RODS 467 



H = true intensity of magnetizing field, H' = intensity of applied field, / = intensity of magnet- 

 ization, 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 (= H + 4W) less than 1000, N is 

 approximately constant ; using a solenoid wound on an insulating tube, or a tube of split brass, 

 the reversal method gives values for N 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 practically 

 agree. 



Values of K X 10* are given where B is determined by the step method and H = H' — KB. 



SMITHSONIAN PHYSICAL TABLES 



