ENGINE No. 22. 



Simple Condensing Engine. 



Kind of engine . . Four valve 



Number of cylinders ........ . 1 



Diameter of cylinder 34/s ins. 



Diameter of piston rod 5 ins. 



Stroke of piston 5 ft. 



Clearance 2 



H.P. constant for one Ib. m. e. p. one rev. per min 2791 H. P. 



Inside diameter of steam pipe 14 ins. 



Inside diameter of exhaust pipe 14 ins. 



Condition of valves and piston regarding leakage Some leakage 



Data and Eesults of Feed- Water Test. 

 Character of steam 

 Duration .... 

 Weight of feed-water consumed 

 Feed-water consumed per hour 

 Pressure in steam-pipe 

 Vacuum in condenser 

 Mean effective pressure 

 Revolutions per minute 

 Indicated horse-power 

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



Measurements based on Sample Diagrams. 



Initial pressure above atmosphere 



Corresponding steam-pipe pressure . . . ... . 



Cut-off pressure above zero 



Kelease pressure above zero 



Mean effective pressure 



Back pressure at mid stroke above or below atmosphere . . 



Proportion of stroke completed at cut-off 



Steam accounted for at cut-off 



Steam accounted for at release 



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

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



18.49 Ibs. 



81.9 



84.2 



75.6 



15.5 



37.17 



13.6 



.172 



12.39 Ibs. 

 13.41 Ibs. 



.669 



.725 



Ibs. 

 Ibs. 

 Ibs. 

 Ibs. 

 Ibs. 

 Ibs. 



Engine No. 22 has slide valves of the gridiron type. It is 

 provided with a siphon condenser, the injection water for which 

 is furnished under natural head. Steam is supplied to the 

 engine from water tube boilers through a 16-inch pipe "331 feet 

 in length. At a point near the engine it is drained by means 

 of a trap, which discharges to waste. On the test 143 Ibs. of 

 water were discharged per hour, and no allowance has been made 



103 



