ENGINE No. 25. 



Simple Condensing Engine. 



Kind of engine Four valve (Corliss) 



Number of cylinders 2 



Diameter of each cylinder . . 26 ins. 



Diameter of each piston rod 3| ins. 



Stroke of each piston 5 ft. 



Clearance 3 % 



H. P. constant for one Ib. in. e. p. one revolution per minute 



each cylinder .16 H.P. 



Inside diameter of steam pipe 8 ins. 



Inside diameter of exhaust pipe . . 10 ins. 



Condition of valves and pistons regarding leakage Some leakage 



Data and Results of Feed Water Test. 



Character of steam Ordinary 



Duration 1.7~> hrs. 



Weight of feed-water consumed 24,416 Ibs. 



Feed-water consumed per hour 13.'.' I ^ Ibs. 



Pressure in steam pipe above atmosphere 82.9 Ibs. 



Vacuum in condenser 25.9 ins. 



Mean effective pressure 36.29 Ibs. 



Revolutions per minute ">">. '.' 



Indicated horse-power 625.6 I. H.P. 



Feed-water consumed per I. II. P. per hour 22.29 Ibs. 



Measurements Based on Sample Diagrams. 



TII 1:1:1-: KM 

 COM H NSIN<;. 



<\i: KM> 



NON- 

 COXDKN-IM.. 



Initial pressure above atmosphere . . . Ibs. 



Corresponding steam-pipe pressure . . . Ibs. 



Cut-off pressure above zero Ibs. 



Release pressure above zero Ibs. 



Mean effective pressure Ibs. 



Back pressure at mid stroke, above or be- 

 low atmosphere Ibs. 



Proportion of stroke completed at cut-off . 



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



Steam accounted for at release .... Ibs. 



Proportion of feed-water accounted for at 

 cut-off, average 



Proportion of feed-water accounted for at 

 release, average 



79.9 

 83.4 

 73.2 



I'M.' 

 40.25 



10. 



.245 

 15.49 

 15.o9 



79.7 



83.4 

 66.2 

 17.6 

 23.94 



+ 3.5 



.24 

 21.17 

 22.23 



"4(1 



Engine No. 25 has a pair of horizontal cylinders exhausting 

 into a jet condenser which is operated by a direct connected 



110 



