136 Trans. Acad. Set. of St. Louis. 



' ~R 



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 



^ = 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. 



