228 ENGINE TESTS. 



Engine No. 57 is a cross compound with unjacketed horizon- 

 tal cylinders and a reheating receiver. The condenser is of 

 the siphon type, the water for which is supplied by an inde- 

 pendent steam pump which takes steam from the main pipe 

 and exhausts into the receiver. Steam is furnished by vertical 

 water-tube boilers in a slightly superheated condition. The 

 load was cotton machinery. The leakage tests showed that the 

 valves and pistons were all in excellent condition throughout, 

 excepting the exhaust valve at the crank end of the low-pres- 

 sure cylinder, which leaked a considerable amount. 



A test was made of the steam consumed by the condenser 

 pump when exhausting into the condenser; and it was found 

 that it used, under these circumstances, 1,176 Ibs. per hour, or 

 .9 of a pound per I. H. P. per hour. When exhausting into 

 the receiver, as it did on the test, the consumption was consid- 

 erably greater ; but a large proportion of it was utilized by 

 increasing the power developed in the low-pressure cylinder. 

 It is estimated that .5 of a pound per I. H. P. per hour is 

 chargeable to the condenser pump when used as it was on the 

 main test. The effect of exhausting the pump into the receiver 

 in this way is indicated in the analysis of the diagrams, which 

 shows a considerably larger amount of steam accounted for 

 in the low-pressure cylinder than that shown in the H. P. 

 cylinder. 



