ENGINE No. 7. 



Simple Non- Condensing. 



Kind of engine Four-valve (Corliss) 



Number of cylinders 1 



Diameter of cylinder 26i 3 & in. 



Diameter of piston rod . 31 in. 



Stroke of piston 4 ft. 



Clearance 3 % 



H. P. constant for one Ib. m. e. p. one revolution per mm. .1285 



Inside diameter of steam pipe 6 in. 



Condition of valves and piston regarding leakage . . . Some leakage. 



Data and Results of Feed-Water Test, Engine No. 7. 



Character of steam Ordinary 



Duration 5.1 hrs. 



Weight of feed-water consumed 34,386 Ibs. 



Feed-water consumed per hour 6,742 Ibs. 



Pressure in steam pipe above atmosphere 80.5 Ibs. 



Mean effective pressure 27.82 Ibs. 



Revolutions per minute 64.7 



Indicated horse-power 232.3 H. P. 



Feed-water consumed per I. H. P. per hour 29.03 Ibs. 



Measurements based on Sample Diagrams. 



Initial pressure above atmosphere 79.6 Ibs. 



Cut-off pressure above zero 76.6 Ibs. 



Release pressure above zero 19.6 Ibs. 



Mean effective pressure 27.3 Ibs. 



Back pressure at mid stroke above atmosphere 5.4 Ibs. 



Proportion of stroke completed at cut-off .237 



Steam accounted for at cut-off 21.77 Ibs. 



Steam accounted for at release 23.31 Ibs. 



Proportion accounted for at cut-off .75 



Proportion accounted for at release .803 



Engine No. 7 is supplied with steam from horizontal return 

 tubular boilers, presumably in a commercially dry condition. 

 The valves were fairly tight, but there was considerable leakage 

 of the piston. The load consisted of cotton machinery. 



