116 Notice of the Steam-Boat Babcock. 
the high pressure plan; but this can never be, until some sul 
stitute is discovered for its justly dreaded boiler ; this is the 
desideratum that will make a revolution in the annals of “ the 
greatest present ever made by philosophy to the arts.” The 
invention of Mr. Babcock is intended to effect this object, 
and consists in converting water into steam by injecting it 
0 a series of cast iron tubes, _ heated to a requi- 
site degree of temperature. The tubes are arranged trans- 
versely in a furnace, in two rows, one tube in the upper and 
one in the lower row, being alternately connected with each 
other by elbows. Connected in this way, they make two dis- 
tinct generators ; the end of one leads into the top ofa cylin- 
der of a high pressure Ps hae and one end of the other into 
the bottom of the cylinder. Each of these generators has @ 
small forcing pump onnéiied to it, for the purpose of inject- 
ing the water to be converted into steam, and which is sup- 
plied from a small reservoir placed on the top of the furnace, 
ry 0 
voir is filled with water, a fire is kindled in the furnace, and 
when the tubes are heated, an injection is made ha 
from one of the pumps into one of the generators, Ss 
the one leading into the tep of the a ) The heat instant- 
ly converts the water into steam, and by opening a te in 
the top of the cylinder, the down stroke of the engine is ~ 
-made. While a the machinery causes the other 
inject a quantity of water into the other generator 
pump tor 
connected with the bottom of the cylinder. A valve admit- 
ting the steam into it, is then opened, and the up stroke o 
the engine is made. Its motion is then contmued without 
any further assistance ; the valves that lead off the steam are 
eS as opened and closed alternately—the engine itself, 
fresh Can-he used, as the salt would, by filling up the tubes, 
render them Uselogs, he improvement, therefore, consists 
in merely attaching these generators to a high pressure en- 
gine, as a substitute for a bot» The advantages gai 
by it are—in the saving of fuel, the s Saving of room, and a 
saving of weight. It is impossible, at said aa tomake an 
‘aceurate estimate of these advantages, as the generator and 
. 
