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 c 3 4 inch 

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

 of only 3V inch, and so approached saturation soouer. 



Magnetizing Current. 

 120 

 178 

 153 

 223 



Monetizing Current. 

 117 

 150 

 184 

 220 



Magnetizing Current. 



83 



115 



149 

 184 

 220 



TABLE II. 

 Series I. 

 Line Current = 1.25 milliamperes 

 Excursion. Mag 



6 

 20 

 15 

 31 



Series II. 



Line Current = 1.5 milliamperes. 



Excursion. Magnetizing Current. 

 14 211 



22 280 



29 301 



36 350 



Excursion. 

 35 

 23 

 20 

 10 



Series IV. 

 Line Current = 2.2 milliamperes. 



Series V. 

 Line Current = 2.6 milliamperes. 



