SHUDDEMAGEN. — DEMAGNETIZING FACTORS FOR IRON RODS. 211 



necessary data from which the most important table was constructed. 

 It might be noted here that the results for the extremes of magnetiza- 

 tion B = 1000, and B = 12,000 are somewhat less reliable, for reasons 

 which will appear. The numbers 10 to 150 are the values of m used. 



TABLE II. [Figure 6.] 



October 2, 1906. 



Diam. = 0.6350 cm. = 1/4 in. 



Reversals. 



Below each value of m is given the series of values of N- 10 4 obtained, 

 one for each interval of 1000 c. g. s. units of B, or gausses. Of course 

 in all these experiments the column under the highest number m gives 

 values for the first curve obtained, for in is always decreased by each 

 sawing off of the ends of the iron rod. 

 See Figure 6 for the magnetization curves of October 2, 1906. 



