ENGINE No. 9. 67 



Engine No. 9 has a pair of cylinders exhausting into a jet 

 condenser with direct-connected air-pump. Steam is supplied 

 in a slightly superheated condition from vertical boilers. 

 Arrangements are made so that one end of one cylinder can be 

 run non-condensing. One test was made with this end operat- 

 ing non-condensing, and another when the whole engine was 

 running condensing. The exhaust valves and steam valves of 

 one cylinder were fairly tight. The steam valves of the other 

 cylinder and the pistons of both cylinders showed some leakage. 

 The load consisted of cotton machinery. 



The loss of steam due to running one end of one cylinder 

 non-condensing is 2.15 pounds per I. H. P. per hour, or 11.8% 

 of the quantity required when running condensing. 



