ENGINE No. 66. 



Four valve (Corliss), 26" x 60". Speed, 51 revolutions per 

 minute. 



The changes in the valve-setting consisted in moving the 

 eccentric forward -J-" on the 12" shaft and shortening the ex- 

 haust-valve rod 2^ turns, or 5 threads, so as to secure earlier 

 release. The Diagrams are from the head end of the cylinder, 

 No. 66a being taken before, and No. 666 after, the change. 



ENGINE No. 66a 



