Kinsley ■ 

 i E 



Discussion of Series Dynamo -Electric Machines. 121 



E a 



B. 



E a +Ri A 



20 

 40 

 60 

 80 

 100 

 120 



181.5 

 338.0 

 474.0 

 594.0 

 700.0 

 795.0 



118.0 

 212.0 

 288.0 

 351.0 

 404.0 

 447.0 



167.0 

 302.0 

 423.0 

 530.0 

 625.0 

 710.0 



163.0 

 302.0 

 423.0 

 531.0 

 629.0 

 717.0 



a' 



.00648 

 .00605 

 .00565 

 .00530 

 .00500 

 .00473 



.00590 

 .00530 

 .00480 

 .00439 

 .00404 

 .00372 



+2.5 

 0.0 

 0.0 

 —0.2 

 —0.5 

 — 1.0 



The values of .. , , . and ^ , ^,. given on page 121 are 

 plotted. See fig. 7. 



As is seen a straight line averages the points very fairlj- 

 from i = 110 to i = 30. 



V, 



/ 



/ 



Fig. 8 



Series Dynamo Surface and Motor Characteristic. 

 Design of Power Circuit. 



From the line we find that 

 (20) 



i-.80 



(21) 



— = 0.00179 

 n 



