Description of Mr:Perkins’ New Steam-Engine. 113 
at-both, ends, with the.exception of the five openings for 
tubes, shewn in the figure. ‘The generator is placed verti- 
cally an a cylindrical furnace EF, whose chimney is G, the 
t being sustained by a pair of bellows, H, wrought b 
the engine, and conveying its blast in the direction IK 10 F. 
A.heat of from 400° to 450° of Fahrenheit is thus applied 
to the generator, which is entirely filled with water. The 
valves in the tubes m,n, which are steel cylinders working 
in hollow steel-pipes, are loaded, the one with 37, and the 
other with 35 atmospheres; so that none of them can rise 
ull the heat.creates.a force greater than the least of these 
weights, 
Let us now suppose, that, by means of the compressing 
pump L. whose handle M is wrought by. the engine, water 
is forced into the generator; this opens the valve above n, 
loaded. with 35 atmospheres, and instantly a portion of the 
ed and compressed water flashes out in the form of 
steam of high elasticity, and of a temperature of 420°; and 
communicating by the steam pipe 2, 2, 2, with the valve 
ox V, it enters the cylinder PP, lying horizontally, and 
gives. motion to its piston PQ, which performs 200 strokes 
ia minute, and drivesa crank R, which gives a rotatory 
motion to.a fly wheel, as seen in the fizure*. When the 
“duction-valve is opened, the steam, after having produ- 
ed_its stroke, is carried by the eduction-pipe 3, 3, 3, into 
the condenser STXV, where it is condensed into water at 
a temperature of about 320°, and undera pressure of 5 at- 
Mospheres ; from thence, by the pipe 6, 6, 6, it is drawn in- 
tothe pump L, whence it is forced along the pipe. 4, 4, 4, 
to the generator, thus performing a complete circuit. 
The forcing-pump acts with a presure exceeding 35 at- 
mospheres; consequently, when the. water received in it 
from the condenser is urged into the generator, itmust ex- 
Pel a portion equal. to itself in volume: this portion, as 
above described, flashes instantly into highly elastic steam. 
eCY ay age 
rcing-pump, too, is so contrived as to act w 
be driven from the generator in a steady current, ana thus 
-*The parallel motion represented at PQ, is not the correct one used by 
Mr, Perkins. . Phe sieeiend is connected by a flexible joint, with a sort of 
‘lage with four wheels at each end, and working ia a. strong horizontat 
tox of steel. | 
“Vek VIRNo. TL 15°" 
