206 Mr. B. Davies on a new form of Amperemeter 



Fig. 2. 



Another form of Magnetic Circuit. 

 Ffc. 3. 



The latest form of Magnetic Circuit. 



In fig. 3 we have a plan of a still better form considered 

 from a practical point of view, though less elegant and com- 

 pact than its predecessors. The construction is evident from 

 the figure. M M are the magnets, now of the horse-shoe 



