ENGINE No. 19. 



Simple Condensing Engine. 



Kind of engine Single Valve 



Number of cylinders 1 



Diameter of cylinder 18.5 in. 



Diameter of piston rod 25 in. 



Stroke of piston 30. in. 



Clearance 7.5 % 



H. P. Constant for one Ib. m. e. p. one rev. per minute . . .0405 H.P. 



Condition of valves and pistons regarding leakage Some leakage 



Data and Eesults of Feed -Water Test. 



Character of steam . Ordinary 



Duration 5.011 hrs. 



Weight of feed-water consumed 27,838.1 Ibs. 



Feed-water consumed per hour 5,555.4 Ibs. 



Pressure in steam pipe above atmosphere 74. 5 Ibs. 



Vacuum in condenser 24.8 ins. 



Mean effective pressure 39.05 Ibs. 



Revolutions per minute 129.33 



Indicated horse-power 204.59 H. P. 



Feed-water consumed per I. H. P. per hour 27.15 Ibs. 



Measurements based on Sample Diagrams. 



Initial pressure above atmosphere 69.3 Ibs. 



Steam-pipe pressure 73.2 Ibs. 



Cut-off pressure above zero 66.8 Ibs. 



Release pressure above zero 29.0 Ibs. 



Mean effective pressure 38.1 Ibs. 



Back pressure at mid stroke, below atmosphere .... 8.9 Ibs. 



Proportion of stroke complete at cut-off .303 



Steam accounted for at cut-off .. 19.17 Ibs. 



Steam accounted for at release 18.97 Ibs. 



Proportion accounted for at cut-off 706 



Proportion accounted for at release 699 



Engine No. 19 has a single unpacked piston valve, controlled 

 by a shaft governor. The engine is provided with a jet con- 

 denser operated by an independent air-pump, driven by steam. 

 The steam used by the condenser was determined separately, 

 and allowance made for it in the record. Steam is supplied by 

 horizontal return tubular boilers, and it is presumed that it was 

 in a commercially dry condition. The piston of the engine 

 was tight, but the valve placed at the middle of its throw 

 showed considerable leakage. The load was cotton machinery. 



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