Magnetic Induction in a Long Iron Bar. 



265 



values are given in Table I. Curves were carefully plotted to 

 a large scale ; those marked Q are given to show the mode 

 of variation along the bar, the points near the centre are not 

 shown as it will be noted from Table I. that some of the 

 curves cross there owing to slight local differences in the 

 iron ; these points are omitted to avoid confusion. The 

 curves subsequently referred to as "Curves Q" must be 

 taken as being drawn carefully through all the points, not 

 those given here. 



Fig. 4. 











































so 











































































\JX 























~vn \ 





centre. 



© 

















































■^ fifl 

























Induction i 



o < 











Q 









































° 4fl 



























Percentage 



© © 











































































10 



























22 



20 



16 14 12 10 



Distance from end in inches. 



The bar was then very carefully welded and re-annealed, 

 wound with a secondary coil and then a magnetizing-coil, and 

 a reversal-curve again taken as for the bar. B, H curves were 

 drawn to suitable scales for high and low inductions so as to 



