ENGINE No. 92. 



Diagrams 92 and 926 are from an 8" steam pipe supply- 

 ing a 23" x 60" non-condensing Corliss engine running at 

 a speed of 75 revolutions per minute. The pipe is 82 feet 

 in length measured from the nearest boiler to the throttle 

 valve, and it contains 5 short right-angle elbows. Diagram 

 92a applies to a complete revolution, and 925 simply to 

 the forward stroke taken while the piston was moving from 



ENGINENo.92a 



-80 

 -60 

 -40 

 -20 



- 

 -80 



-60 



40 



-20 



- 



the head end of the cylinder. The indicator diagram from the 

 head end of the cylinder is also given. Referring to the latter, 

 it appears that just prior to the beginning of the stroke the 

 pressure rises in the steam pipe. Coincident with the move- 

 ment of the piston forward during the admission, the pressure 

 in the pipe gradually falls up to the point of cut-off, and when 

 this occurs it rises to a point some 10 Ibs. above the line of 



327 



