HOW THE TESTS WERE CONDUCTED. 37 



Proportion of direct stroke completed at cut-off ...... .172 



Ditto at release ................. .903 



Proportion of return stroke uncompleted at compression . . . .048 



The steam accounted for at cut-off is [ (.172 +.02) 



x .1773 - (.048 + .02) x .0085] = 369.9 x (.03404 - .00056) 

 = 369.9 X .03348 = 12.39. The steam accounted for at release 



is 18 ' 75Q [ (.903 + .02) x .0399 - (.048 + .02) X .0085 = 

 oT.lT 



369.9 (.03682 - .00056) = 369.9 x .03626 = 13.41. 



Engine No. 59 Triple Expansion. 



H. P. Cylinder at Cut-off. 



Clearance 2.5 % 



Cut-off pressure 145.2 



Weight per cubic foot at cut-off pressure . .3277 



Compression pressure i 46.8 



Weight per cubic foot at compression pressure .1129 



Mean effective pressure 60.56 



M. E. P. of all the cylinders, referred to H. P. cylinder . . . 165.47 



Proportion of direct stroke completed at cut-off .346 



Proportion of return stroke uncompleted at compression . . . .006 



The steam accounted for at cut-off is 18 ' 75Q [ (.346 + .025) 



x .3277 - (.006 + .025) x .1129] = 83.1 X (.1216 - .0035) 

 = 83.1 x .1181 = 9.81. 



Intermediate Cylinder at Cut-off. 



Clearance 2.5 % 



Cut-off pressure 38.7 Ibs. 



Weight per cubic foot at cut-off pressure .0945 



Mean effective pressure . 13.22 



M. E. P. of all the cylinders, referred to the intermediate cylinder, 56.28 



Compression pressure 20.7 



Weight per cubic foot at compression pressure .0524 



Proportion of stroke completed at cut-off .406 



Proportion of return stroke uncompleted at compression . . . . .008 



