ENGINE No. 1OO. 



Diagram No. 100 refers to a case where a reservoir was 

 installed in the steam pipe close to the cylinder, and the dia- 

 gram was taken from this reservoir. The engine is a Corliss 

 30" x 48", running at a speed of 80 revolutions per minute. 

 The receiver is supplied from an 8" pipe 223 feet in length, 

 which contained six short right^angle bends, while the engine 

 is supplied from the reservoir through a 10" pipe 12' long, 

 containing two short right-angle elbows. The size of the 

 reservoir is 42" in diameter and 8' in height. 



(00- 

 80- 

 60- 

 40- 

 20- 



0- 

 10- 



ENGINE No. 1OO 



In this diagram the fluctuations of pressure do not seem to 

 follow the admission and cutting off of the steam to any great 

 extent, and at the worst they are confined within narrow limits. 

 The extreme change of pressure from the highest to the lowest 

 is three pounds. Comparing this with the previous instance, 

 No. 99, the difference is exceedingly marked. There the change 

 of pressure was some thirteen pounds. If we investigate these 

 two cases carefully it will be found that the rate of flow of 

 steam from the boiler to the reservoir is forty-three feet per 

 second, and in the other case (No. 99) the rate of flow close to 

 the throttle valve was twenty-eight feet per second. The con- 

 ditions as to the speed of the steam and the quantity with- 

 drawn per stroke with reference to the size of the pipe was 



