ENGINE No. 4. 



Simple Condensing. 



Kind of engine Four-valve (Corliss) 



Number of cylinders 1 



Diameter of cylinder 34.2 ins. 



Diameter of piston-rod 41 ins. 



Stroke of piston 5 ft. 



Clearance 3 % 



H.P. Constant for one Ib. m.e.p., one rev. per minute . .2764 



Inside diameter of steam pipe 6 ins. 



Inside diameter of exhaust pipe . 7 ins. 



Condition of valves and piston regarding leakage . . . Fairly tight. 



Data and Results of Feed Water Test, Engine No. 4. 



Character of steam Superheated 25 deg. 



Duration 10.8 hrs. 



Weight of feed-water consumed 125,420 Ibs. 



Feed-water consumed per hour 11,613 Ibs. 



Pressure in steam pipe above atmosphere 83 Ibs. 



Vacuum in condenser 24.8 ins. 



Mean effective pressure 35.53 Ibs. 



Rev. per min 53.3 



Indicated horse-power 523.43 H. P. 



Feed-water consumed per I. H. P. per hour 22.19 Ibs. 



Measurements Based on Sample Diagrams : 



Initial pressure above atmosphere . . 

 Steam-pipe pressure above atmosphere 



76.1 Ibs. 

 83 Ibs. 



HEAD END. 

 NON-CONDENSING. 



CRANK END 



CONDENSING 



Cut-off pressure above zero Ibs. 



Release pressure above zero Ibs. 



Mean effective pressure Ibs. 



Back pressure at mid-stroke, above or 



below atmosphere Ibs. 



Proportion of stroke completed at cut-off Ibs. 

 Steam accounted for at cut-off . . . Ibs. 

 Steam accounted for at release . . . Ibs. 

 Proportion accounted for at cut-off 



(average of two ends) Ibs. 



Proportion accounted for at release . Ibs. 



71.9 



17.5 



28.22 



2.1 



.237 

 18.79 

 18.75 



76.7 

 18.1 

 41.88 



11.7 



.230 

 15.18 

 15.43 



.766 



.77 



53 



