:MU 



PRO( fGS OF THE AMERICAS ACADEMY. 



But as even for the high value // = .".'», /> is somewhere near 15,000, 

 we see that the error introduced by neglecting the // in the brackets is 

 but I part in 500, wind is much less than the experimental errors. 

 Therefore, since the ballistic throw is proportional to />'. it is very 



10 16 20 



Figure 8. [Tablh IV.] 



Reversal magnetization curves tor a Bessemer Boft steel rod of diameter 

 0.4768 era. 



much more convenient to construct the .V curves from the formula 



II = U' - M; i- 



EXPERIMENTAL RESULTS FOR DEMAGNETIZING FACTORS. 



Let us now tabulate the actual values obtained for the end correc- 

 ting, or demagnetizing factors .V, of a number of rods of Bessemer 

 1 ('copper coated , which is a very homogeneous -oft iron. Later on 

 we shall see just how these values were determined, and give the 



