4-B] CIRCLE DIAGRAM. 1*7 



in any apparatus by means of high reactance within, or external 

 to, the apparatus. Constant current generators (8, Exp. 3~A, 

 27, 27a, Exp. 3~B) and constant current transformers (24, 

 24a, Exp. 5-C) are so constructed. 



15. Rectangular Coordinates. The results shown in polar 

 coordinates, in Fig. 2, should also be shown in rectangular coordi- 

 nates, as in Fig. 3, the values of I and 6 being plotted for different 

 values of the total resistance of the circuit. For small values oi 

 R it will be seen that the current is nearly constant. 



