ENGINE No. SO. 



Four valve (Corliss) tandem compound, 18" and 30" x 48". 

 Speed, 63 revolutions per minute. 



The low-pressure cylinder of this engine was operated by 

 double eccentrics. The diagrams here given show the effect 

 produced by advancing the eccentric which drives the exhaust 

 valves of the low-pressure cylinder 3^" on the 12" shaft. At 

 the same time the exhaust rod on the high-pressure cylinder was 

 lengthened 2 threads, so as to give greater compression. The 

 diagrams were taken at the head end of both cylinders, No. 

 80 before, and No. 806 after, the adjustments. 



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