ENGINE No. 21. 



Simple Non- Condensing Engine. 



Kind of engine ... Four valve 



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



Diameter of cylinder Hi ins. 



Diameter of piston rod .... , . . If ins. 



Stroke of piston 20 ins. 



Clearance 10 % 



H. P. constant for one Ib. in. e. p. one revolution per min. .0104 H.P. 



Inside diameter of steam pipe 4 in. 



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



Data and Results of Feed- Water Test. 



Character of steam Superheated 4 



Duration 8 hrs. 



Weight of feed-water consumed 10,341 Ibs. 



Feed-water consumed per hour . 1,292 Ibs. 



Pressure in steam pipe above atmosphere 64.5 Ibs. 



Mean effective pressure 15.7 Ibs. 



Revolutions per minute 198.3 



Indicated horse-power 32.26 1.H.P. 



Feed-water consumed per I. H. P. per hour 40.04 Ibs. 



Measurements based on Sample Diagrams. 



Initial pressure above atmosphere 63.1 Ibs. 



Corresponding steam-pipe pressure .... ...... 67 Ibs. 



Cut-off pressure above zero 60.4 Ibs. 



Release pressure above zero 22.4 Ibs. 



Mean effective pressure 15.4 Ibs. 



Back pressure at mid stroke, above atmosphere 2 Ibs. 



Proportion of stroke completed at cut-off 238 



Steam accounted for at cut-off 24.85 Ibs. 



Steam accounted for at release 25. 13 Ibs. 



Proportion of feed-water accounted for at cut-off .62 



Proportion of feed-water accounted for at release .627 



Engine No. 21 has balanced slide valves. Steam is furnished 

 from a horizontal return tubular boiler of special design, which 

 is provided with a considerable amount of steam-heating sur- 

 face. The steam was superheated at the boiler 30, and at a 

 point near the engine 4. One of the exhaust valves and the 

 piston were fairly tight. The other steam valve and the other 



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