OF ARTS AND SCIENCES. 



241 



A series of observations was nest made in which the magnetizing 

 current was varied as with the previous Series I. to VII., and the 

 line current kept constant, but with the diaphragm at a distance of 

 ^ inch from the pole of the field-magnet. The results are given 

 in Table IV., and those of all the series except XVII. are shown 

 graphically in Figure 4. 



Line Current = 1.45 milliamperes. 



Magnetizing Current. Excursion. Magnetizing Current. Excursion. 



202 38 229 40 



216 35 240 53 



Series XVIIL 



Line Current = 1.70 milliamperes. 



Excursion. Magnetizing Current. 



18 183 



27 196 



32 203 



31 201 



Magnetizing Current. 



97 



117 



136 



167 



Magnetizing Current. 

 108 

 126 

 144 

 161 

 VOL. XXVIII. (n. 



Series XIX. 

 Line Current = 2.05 milliamperes. 



Excursion. Magnetizing Current. 



13 183 



28 192 



46 195 



50 196 



s. XX, J 16 



Excursion. 

 31 

 30 

 40 

 37 



Excursion. 

 39 

 38 

 45 

 49 



