TURBINES 



219 



TABLE XXXIX Continued 



TESTING FLUME OF THE HOLYOKE WATER POWER Co., HOLYOKE, MASS. 

 Report of tests of a 25 Right-hand I. P. Morris Company turbine wheel. 



Passing to the <j>-HPi diagram, points are located on the 2.5 gate 

 curve at the two values of </> just found. These are two points on 

 the desired curve. Similar points of intersection of the 86 per 

 cent efficiency line with the ^-efficiency curves for other gates 

 are similarly located and the resulting points joined up. 



The diagram obtained may be viewed as a contour map of a 

 mound or hill, the heights of which in a direction perpendicular 

 to the paper may be imagined to represent efficiency. If the hill 



