0-2Rp O^Rp 0-6/?p OQRp Rp 



Shaft rotation - — »• 



Graph 3. Pontentiometric control of power. Potentiometer 

 fed from generator matched to load 



0-2 /?p QiiRp OSRp OQRp Rp 



Ri 



Shaft rotation »- 



Graph 4. Potentiometric control of power. Potentiometer 

 fed from constant-voltage type generator 



264 



