64 ENGINE TESTS. 



It was subsequently found that the loss of temperature between 

 the boilers and the throttle valve was 60 degrees ; so that the 

 steam entering the cylinder was still in a slightly superheated 

 condition. The valves and pistons were fairly tight. The load 

 consisted of cotton machinery. 



Advantage was taken of the comparatively light load to make 

 a trial of the engine under two pressures. The other conditions 

 of running were the same in both cases. 



It appears that the increase of pressure from 53 pounds to 

 68 pounds was attended by a reduction in the steam consump- 

 tion amounting to nearly four per cent. There is a marked 

 increase in the cylinder condensation (and leakage), with the 

 shortening of the cut-off and increase of pressure. 



