OF ARTS AND SCIENCES. 



237 



reached when the magnetizing current was only 225 milliamperes. 

 This difference arises from the fact that in the earlier experiments 

 the end of the core of the magnet was set at a distance of ^^ inch 

 from the diaphragm, while in the present ones it was at a distance 

 of only ^^ inch, and so approached saturation sooner. 



Magnetizing Current. 

 117 

 150 

 184 

 220 



Magnetizing Current. 

 83 

 115 

 149 

 184 

 220 



Magnetizing Current. 

 83 

 119 

 151 

 181 

 223 



TABLE II. 



Series I. 



Line Current = 1.25 milliamperes. 



Series II. 

 Line Current = 1.5 milliamperes 

 Excursion. Ma 



14 

 22 

 29 

 36 



Series III. 

 Line Current = 1.9 milliamperes. 

 Excursion. Magnetizing Current. 



8 244 



18 280 



26 306 



36 352 



44 



Series IV. 

 Line Current = 2.2 milliamperes. 



Excursion. Magnetizing Current. 



Excursion. 

 40 

 29 

 20 

 15 



9 

 16 

 85 

 45 

 51 



245 

 283 

 308 

 351 

 486 



Series V. 

 Line Current = 2.6 milliamperes. 



Magnetizing Current. 

 263 

 291 

 312 

 827 

 372 

 438 



Excursion. 

 53 

 37 

 27 

 18 

 10 



Excursion, 

 66 

 43 

 36 

 26 

 20 

 15 



