of Varying Currents in Inductive Circuits. 



203 



more efficient if the arms of the needle are long enough to 

 allow of the stops being placed outside the space in which 

 useful turns of wire can be wound. 



The instrument which we designed, and which was con- 

 structed by one of us according to the foregoing principles, 

 is shown in figs. 4 and 5. The figures explain themselves, 



Fig-. 4. 



FT 



A-- 



~7\ 



V7777, 



\ 



PLAN 



except perhaps with regard to the construction of the needle. 

 This is shown in plan in fig. 5, and again in back and end 



