FEB. 4, 1921 VINAL AND SNYDER: OSCILLOGRAPH MEASUREMENTS 53 



Analysis of the curves has suggested the possibility of using this 

 method for the study of problems relating to the design of engines 

 and starter systems. The method provides an exact means of mea- 

 suring the speed of rotation and of detecting small changes in speed 

 from one revolution to another. Additional experiments to show the 

 effect of temperature compression, lubrication and throttle opening 

 were made also. These will be described in the complete paper. 



