Kinsley — Discussion of Series Dynamo-Electric Machines. 129 



shunt dynamo, with a very strong field, with the outside cir- 

 cuit left open and hence used as a series machine. 



A small Wood dynamo used in this way gave the results 

 shown in the figures. The speed was gotten automatically 

 by means of a chronograph. 



3.00 



3.50 



4.00 



Fig 15 



Series Dynamo Test. Computation of Constants 

 when the Speed does not Change. 



Fio-s. 14, 15, and 16 gave the data as taken. The exces- 

 sively large scale makes the points appear somewhat scat- 

 tered. 



The equation of the line of fig. 14 is 



— I Ri = n, see p. 118 



a a 



When R = a constant = 12.23 ohms. 



- + 2.935 R- = 18.00. 

 a a 



- + 3.935 R-= 22.00 

 a a 



from fig. 14 



a = 1.945 h = 0.635 



