170 ENGINE TESTS. 



Engine No. 43 is a horizontal cross compound with jacketed 

 cylinders and unjacketed receiver. It exhausts into a jet con- 

 denser provided with a direct connected air-pump. The jacket 

 space of either cylinder, which is confined, to the barrel of the 

 cylinder, forms a thoroughfare through which the steam passes 

 to the top chest, the steam entering at the bottom. The spaces 

 are drained by traps. Steam is supplied by vertical boilers 

 which superheat. The valves and pistons of the H. P. cylin- 

 der leaked a small amount, but those of the L. P. cylinder were 

 practically tight. The load consisted of cotton machinery. 



The test reported is the collective result of four indepen- 

 dent trials of 4.5 to 5 hours each. 



A noticeable feature in these results is the increase in the 

 steam accounted for at release H. P. cylinder over that shown 

 at cut-off, viz., .146. In working out these figures the clear- 

 ance was assumed at 24-^. If the clearance were in reality 

 1 % more (i. e., 3.5 %) the increase is reduced to .123. Even 

 this is notable. 



