406 W. A. Norton on Ericsson’s Caloric Engine. 
COMPARISON WITH THE STEAM ENGINE. 
1. Comparative Consumption of Fuel. 
This is presented in the following table. 
Tasre I. 
Name of ship, \Press, of steam or power. Lbs. of bit. coal.; Eauiv. Ibs. of anth. coal,! 
ay Ibs. i bs. | 
Ericsson, ....... 64 300 iy 1:87 
ieee cas. 6'3 and 6:9 248 sgebes Fs cieee 
ce 103 600* bate 0-93 v | 
Humboldt, 29-1 2397 2-71 9:23 to 2°37 | 
Franklin, ......- 203 1732 3°55 2-48 
Washington, 18:3 9 3:38 2°37 
MUNGO 355. sae 17-4 3-42. 2:39 
OBI, 24 « os 0+ « 23-4 1732 ae 2°59 | 
RPCOr ri se coe. 23°4 1732 cas 2°59 
MGoN: 55) eee 22°5 534 3°81 2°66 
Fulton, (the third,)| , 31°8 823 te 2717 
South America,..! 31°8 1168 en 2°60 
_ The second column shows the mean effective pressure of the 
steam, or air, per square inch, on the piston; the third the real 
rse-power actually developed by the engines of each ship; the 
fourth the number of pounds of bituminous coal, per horse-powet 
per hour, consumed ; the fifth the equivalent amount of anthra- 
cite of coal, i. e., the number of pounds that would do the same 
work. These several quantities answer to the average perform- 
ance of the engines, except in the case of the South America, (a 
Hudson river boat,) in which they show the maximum perform- 
ance. The data for the calculations were obtained for the most 
rt, from Stuart’s “Naval and Mail Steamers of the nited 
States.” The mean effective pressure of the steam, for the whole 
stroke, has, in each instance been diminished 2 Ibs. to allow {or 
the reaction of the imperfectly condensed steam on the other side 
-of the piston. The reductions from the fourth to the fifth column 
were effected, except in the case of the Humboldt, by multiply- 
i 
ing by zi; (nearly in accordance with the results of certain expe 
it ing results were obtained by diminishing vere 
er 
pressure 2!bs., which is about the usual excess 
the cylinder pressure. ez oat 
ee seinen wt 0 pressure of 
12 Thain the enews estimate of the power of the engines pressure jf 
