38 ENGINE TESTS. 



The steam accounted for at cut-off is, - ^ - X [ (.406 + 



OO.28 



.025) x .0945 - (.008 + .025) x .0524] = 244.3 x (.0407 - 

 .0017) = 244.3 x .039 - 9.53. 



L. P. Cylinder at Cut-off. 



Clearance 2.5 % 



Cut-off pressure 16.0 Ibs. 



Weight per cubic foot at cut-off pressure .0411 " 



Mean effective pressure 10.16 " 



M. E. P. of all the cylinders, referred to L. P. cylinder . . . 25.46 " 



Compression pressure 2.3 



Weight per cubic foot at compression pressure .0066 '- 



Proportion of stroke completed at cut-off .357 



Proportion of return stroke uncompleted at compression ... 



The steam accounted for at cut-off is, ~ - [ (.357 + .025) 



x .0411 -- (.025 x .0066)] = 540.1 x (.0157 - .00017) = 

 540.1 x .01553 = 8.39. 



It is unnecessary to give the computations for the release 

 points of these diagrams, the method being illustrated in the 

 example given above for Engine No. 22. 



The following table gives the quantity - for mean 



m.e.p. 



effective pressures running from 10 to 100, advancing by two- 

 tenths of a pound ; and from 100 to 200 advancing by pounds. 



