ENGINE No. 1 1. 



Simple Non- Condensing Engine. 



Kind of engine . Four valve 



Number of cylinders 1 



Diameter of cylinder 161 ins. 



Diameter of piston rod 21 ins. 



Stroke of piston 32 ins. 



Clearance 4 % 



H.P. constant for one Ib. m. e. p. one rev. per min 0346H.P. 



Inside diameter of steam pipe 5 in. 



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



Data and Results of Feed- Water Test. 



Character of steam ordinary 



Duration 6.47 hrs. 



Weight of feed-water consumed 10. 277 Ibs. 



Feed-water consumed per hour 1.S7'. Ibs. 



Pressure in steam-pipe above atmosphere 61 Ibs. 



Mean effective pressure 18.19 Ibs. 



Revolutions per minute 7t>.8 



Indicated horse-power 50.2 I. H.P. 



Feed- water consumed per I. II. P. per hour 37.43 Ibs. 



Measurements based on Sample Diagrams. 



Initial pressure above atmosphere 58.6 Ibs. 



Cut-off pre , sure above zero "(;. 1 Ibs. 



Release pressure above zero 16.7 Ibs. 



Mean effective pressure IM.-J'.I ll>s. 



Back pressure at mid stroke above atmosphere 1.1 Ibs. 



Proportion of stroke completed at cut-off .2:54 



Steam accounted for at cut-off 21. ">2 Ibs. 



Steam accounted for at release 27.42 Ibs. 



Proportion accounted for at cut-off .:>7"> 



Proportiouaccountedforatrelea.se .7:',i' 



Engine No. 11 is controlled 1>\ a shaft governor. It has 

 piston valves provided with means for adjustment to take up 

 wear. Steam is supplied from return tubular boilers, probably 

 in a commercially dry condition. The piston and one steam 

 valve were fairly tight. The other steam valve and both ex- 

 haust valves leaked. The engine was employed in driving a 

 machine-shop. 



The effect of leakage, low pressure, and light load is seen in 

 the excessive consumption of steam shown on this test. 



74 



