ENGINE No. 63. 



Four valve (Corliss), 18" x 48". Speed, 57 revolutions per 

 minute. 



This engine is of the ordinary Corliss type with single eccen- 

 tric. The changes in the valves consisted in moving the 

 eccentric forward -J- inch on a 10" shaft, and shortening the 

 steam-valve rod 4 turns, or 4 threads. The diagrams were 

 taken from the head end, No. 63a before, and No. 636 after, 

 the change. 



ENGINE No. 63a 



ENGINE No. 63b 



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