136 Trans. Acad. Sci. of St. Louis. 



0.003745 - = 0.00828 — - when i = 10 

 n n 



0.003280- = 0.00695 — - when i = 13 

 n n 



" = 2.87 - = 0.00248 



n n 



If we wish n = 1300 



n, = 3730 R = — 3.22 



With these machines it will therefore never be possible to 

 obtain a constant motor speed. 



The very close coincidence between the computed and 

 observed value of speed shows that this method of investiga- 

 tion can be accurately used. 



Issued May 20, 1898. 



