ENGINE No. 28. 



Simple Condensing Engine. 



Kind of engine Four valve (Corliss) 



Number of cylinders . l 



Diameter of cylinder 32i ins. 



Diameter of piston rod 4 ins. 



Stroke of piston \ 5 ft. 



Clearance 2i % 



H. P. Constant for one Ib. m.e.p., one rev. per minute . .2451 H.P. 



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



Data and Results of Feed - Water Test. 



Character of steam Ordinary 



Duration 5.1 hrs. 



Weight of feed-water consumed 55,001 Ibs. 



Feed-water consumed per hour 10,784.5 Ibs. 



Pressure in steam pipe above atmosphere 70. 1 Ibs. 



Vacuum in condenser -J4.2 ins. 



Mean effective pressure 38.26 Ibs. 



Revolutions per minute 59.13 



Indicated horse-power 554.4 I. H.P. 



Feed -water consumed per I. II. P. per hour 19.45 Ibs. 



Measurements based on Sample Diagrams. 



Initial pressure above atmosphere <>7.~> Ibs. 



Corresponding steam-pipe pressure 7<M Ibs. 



Cut-off pressure above zero 61.5 Ibs. 



Release pressure above zero 17.6 Ibs. 



Mean effective pressure 38.2(3 Ibs. 



Back pressure at mid stroke, bel< >\v atmosphere .... 11.0 Ibs. 



Proportion of stroke completed at cut-off i_ J 71 



Steam accounted for at cut-off 15.20 Ibs. 



Steam accounted for at release 15.27 Ibs. 



Proportion of feed-water accounted for at cut-off 781 



Proportion of feed-water accounted for at release .... . 785 



Engine No. 28 exhausts into a jet condenser, with direct 

 connected air-pump. The boilers are of the horizontal return 

 tubular type. The steam valves were practically tight. There 

 was some small amount of leakage of the piston, and a trifling 

 leakage of the exhaust valves. The load was cotton machinery. 



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