ENGINE No. 13. 



Simple Non-Condensing Engine. 



Kind of engine Single valve 



Number of cylinders 1 



Diameter of cylinder 14.5 in. 



Diameter of piston rod 2k in. 



Stroke of piston 13 in. 



Clearance 10 



H. P. constant for one Ib. m. e. p. one revolution per min. . . .0108 H.P. 



Inside diameter of steam pipe 4 in. 



Inside diameter of exhaust pipe 6 in. 



Condition of valves and piston regarding leakage . . Considerable leakage 



Data and Results of Feed- Water Test. 



Character of steam Ordinary 



Duration L'."> hr. 



Weight of feed-water consumed 4,350 Ibs. 



Feed-water consumed per hour 1,740 Ibs. 



Pressure in steam pipe aboTe atmosphere 102.5 Ibs. 



Mean effective pressure 20.07 Ibs. 



Revolutions per minute 246 



Indicated horse-power 53.26 I. H.P. 



Feed-water consumed per 1 . II. 1'. per hour 32.07 Ibs. 



Measurements based on Sample Diagrams. 



Initial pressure above atmosphere . 98.1 Ibs. 



Cut-off pressure above zero 07.0 Ibs. 



Release pressure above zero 40.8 Ibs. 



Mean effective pressure 20.07 Ibs. 



Back pressure at mid stroke above atmosphere -4-2.6 Ibs. 



Proportion of stroke completed at cut-off .119 



Steam accounted for at cut-off . . . 17.72 Ibs. 



Steam accounted for at release 22.59 Ibs. 



Proportion accounted for at cut-off .">:)'. 



Proportion accounted for at release .;591 



Engine No. 13 is of the high-speed class, with a shaft 

 governor. The valve is of the piston type, unpacked. Steam 

 is supplied from a water-tube boiler, and is presumed to 

 be in a commercially dry condition. The piston was fairly 

 tight. The valve at one end was fairly tight, but at the other 

 end it leaked badly. The load consisted of a dynamo furnish- 

 ing current for electric lighting. 



The leaking of the piston valve is evidently responsible in 

 some degree for the comparatively poor showing on this engine. 



