6G TRAySACTIONS OF THE AMERICAN INSTITUTE. 



Bahcock and 



Wilcox. Harris. 



Mean effective pressure, both ends of cylin- 

 der per indicator, pounds 31 . 057 29 . 728 



Mean back pressure (independent of cush- 

 ion), per indicator, pounds . 800 . 680 



Mean friction pressure, per indicator, lbs . . 2 . 848 1 . 786 



Dynamometers. 



!ri9.195 

 \ .«500 

 North(X"o^o^)....H.P. 17.383 [19.695 

 r21.18 

 J 1.125 

 Middle (X^^«)...H. P. 122.305 21.516 

 South(Xiifo)----.H:. P. 5.508 6.180 

 A Kevolutions of east shaft, N. &' S. dyna- 

 mometers 256 . 1 252 . 55 



B Kevolutions of west shaft middle dyna- 

 mometer \... 140.3 138.59 



"Water.. 



r 8.0292 

 J .0453 



Difference of time for meter, hours 7 . 9847 [ 7 . 9839 



Total water used in above time, cubic feet. 256 . 5 254 . 9 



Total water used during experiment, lbs. 160G1 . 968 15064 . 376 



J?. Water per hour, pounds 2007 . 746 1995 . 547 



Temperatures. 



Temperature of feed water, degrees Fah- 

 renheit 47.0 47.0 



Temperature of engine room, degrees Fah- 

 renheit 72.6 66.5 



Temperature fire room, degrees Fahrenheit 42.7 49.7 



Barometer, inches of mercury 30 . 95 30 . 29 



Coal used during experiment,* pounds .. . 2500.0 1957.5 

 Water evaporated, per pound of coal from 



temperature, above named, pounds 6 . 425 8 . 155 



The principal data concerning the trials to determine the relative 

 economy of the engines have been condensed in table No. 1. 

 ♦Notreliable, Bce text. 



