condenser, when corrected for the difference in the two tests in

the heat added in the No. 4 heater, to be 69.2% of that charged to the engine. Beginning with this quantity of 136 pounds per minute and making the additions of weight necessary to raise the feed water to the temperature observed in each heater by the addition of wet steam of the quality determined by the several calorimeters, the computed weight going from No. 4 heater would be 8.3 pounds in excess of the known weighed amount, although the additions of heat by this computation would be in excess only 595 B. T. U. in 51,733.

25. An adjustment of the several computed weight additions in each heater was, therefore, necessary and each was multiplied by 88% on the assumption that the cumulative errors were equally distributed. This gives the following dis- · tribution of weight used per minute:

Steam fed to engine per minute (weighed).
Steam sent to reheater line

Steam sent through No. 1 cylinder.
Steam taken from No. 1 receiver

Steam sent through No. 2 cylinder
Steam taken from No. 2 receiver.:
Steam sent through No. 3 cylinder.

Pounds

..196.5

20.2

.176.3

14.9 .161.4 11.0 .150.4

27. The heat given up to each jacket was computed from the quality determinations on each side of the jacket and the weight flowing to the several heaters.

28. No measurement of the radiation from the machine was attempted because of the complication incident to maintaining the several pressures required and because the distribution of perhaps 2% of the total heat used through the numerous devices was hardly warranted.

RESULTS FROM THE AIR COMPRESSING CYLINDERS.

33. The air compressing is accomplished in two low pressure and two high pressure cylinders, each double acting. The four cards showing the performance of the same function were superimposed and a composite was drawn representing the mean condition shown in Fig. 16.

34. The volumetric efficiency is 98.43% and would require a speed of 77.3 r. p. m. to deliver the required 9000 cu. ft. of air per minute. The actual H. P. shown by the air cards is 883.2 H. P. while the same weight of air compressed isothermally would require but 731.3 H. P., showing an efficiency of the two stage compression compared with isothermal of 82.8%. 35. The temperatures of air and jacket water were as

36. The water was supplied to the several jackets in series through a shunt circuit from a line supplying water to the intercooler.