106 



ENGINE TESTS. 



made automatic through the action of a shaft governor. Steam 

 is supplied from a horizontal return tubular boiler. A calorim- 

 eter test showed that it was practically dry. The piston was 

 fairly tight. The valve showed some leakage. The load con- 

 sisted of a Sturtevant Blower. A series of tests were made 

 under conditions of different loads, but practically constant 

 boiler pressure. 



Another test in the same series with a load of 28.44 I. H. P., 

 which is intermediate between the first and the second, gave a 

 feed-water consumption of 31.46 Ibs. per I. H. P. per hour, and 

 the proportions of steam accounted for were respectively .685 

 and .694. In this series of tests the gradual improvement in 

 the economy as the load is increased is a noticeable feature, as 

 is also the uniform increase in the proportion of steam ac- 

 counted for at the cut-off. Another point to be noticed is that 

 as the cut-off becomes later, the amount of steam present at the 

 release compared with that at cut-off is gradually reduced. In 

 the first experiment the steam at release is the greater of the 

 two, while in the last it is the smaller. 

 80-i l\ ENGINE No. 23a 



60- 



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20- 



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Head End 



Crank End 



