50 ENGINE TESTS. 



Engine No. 3 has a pair of cylinders exhausting into a jet 

 condenser operated by a direct-connected air-pump. The ex- 

 haust passages and piping are arranged so as to run one end of 

 one cylinder non-condensing. One test was made running both 

 cylinders condensing, and one test running three ends condens- 

 ing and one end non-condensing. The engine is supplied with 

 steam from horizontal return tubular boilers. The quality of 

 the steam was not tested, but it was probably commercially dry. 

 One steam valve and the exhaust valves of one cylinder showed 

 some leakage. The remaining valves, and the pistons, were 

 fairly tight. The engine was employed in driving several man- 

 ufactories working in connection with water-wheels. 



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

 non-condensing is about 1%. The gain in fuel that would 

 be produced by utilizing the exhaust steam from this end for 

 heating feed-water for the boilers, assuming that it increases 

 the temperature from 60 to 210 degrees, is sufficient to cover 

 the increased steam consumption and leave a net fuel saving of 

 some 7%. 



