OF ARTS AND SCIENCES. 



241 



A series of observations was next 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 

 gL 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. 



Magnetizing Current. 

 161 

 173 

 183 

 189 



TABLE IV. 

 Series XV. 



Line Current = 0.82 niilliamperes. 



Excursion. Magnetizing Current. Excursion. 



13 214 is 



16 230 14 



19 235 14 



22 236 22 



Series XVI. 



Line Current = 1.25 niilliamperes. 



Magnetizing Current. Excursion. 



Series XVII. 

 Line Current = 1.45 niilliamperes. 

 Magnetizing Current. Excursion. Magnetizing Current. 



202 38 229 



216 35 240 



Series XVIII. 



Line Current = 1.70 niilliamperes 



Excursion. Magnetizing Current. 



18 183 



27 U""' 



32 203 



31 201 



Magnetizing Current. 



97 



117 



136 



167 



Magnetizing Current 

 108 

 126 

 144 

 161 



VOL. XXVIII 



Series XIX. 



Line Current = 2.05 niilliamperes. 



Excursion. Magnetizing Current, 



13 183 



28 192 



46 196 



50 196 



N. 9. XX.) 16 



Excursion. 

 40 

 53 



Excursion. 

 31 

 30 

 40 

 S7 



Excursion. 

 39 



I i 



