ENGINE No. 62. 



Four valve, 16" x 48". Speed, 82 revolutions per minute. 



This engine is of the 4-valve type, the steam valves being 

 slide valves, and the exhaust, Corliss valves. They are oper- 

 ated by separate eccentrics. Changes in the setting of the 

 valves consisted in moving the steam-valve eccentric ahead 

 2" measured on the circumference of the 8" shaft, moving the 

 exhaust eccentric ahead |", adjusting the tappet which operates 

 the steam valve so as to obtain earlier admission, and shorten- 

 ing the exhaust>valve rod two turns to obtain earlier release. 

 The diagrams were taken from the head end, No. 62 a before, 

 and No. 625 after, the change. 



In connection with these changes feed-water tests were made 

 which showed a saving of 8 f / c on the steam used by the plant 

 of which this engine formed a part; the total power of the 

 plant being somewhat more than twice the power developed 

 by this engine. 



ENGINE No. 62a 



282 



