1824.) 
H.—A cylindrical balance (or minor 
beam) moyeable on an axis, and, by means 
of tappets, applied to the rod G. The ba- 
lance acts simultaneously with the beam 
“A”. Al; whilst it is applied to give motion to 
the subordinate parts of the engine. 
J.I.—A horizontal gas-pipe, in connec- 
tion with a service-pipe, i; communicating 
to a reservoir or gas-holder, placed at any 
convenient distance. The extremities of 
the pipe I. I. are carried into the lower 
part of the interior cylinders C.C., where 
they terminate beneath the surface of the 
water; having a nozzle or gas-burner a 
little above the surface. 
The gas is allowed to enter each cylinder 
alternately, by the stop-cocks y.y., which 
are turned by a chain connected with the 
balance H. 
K.K’.—A minor gas-pipe, communicat- 
ing with the gas-holder by the pipe k. This 
pipe is also furnishéd with stop-cocks s.s., 
and extended to the side of each cylinder, 
respectively, where it furnishes two small 
gas-lights, to be kept burning during the 
working of the engine. 
L. L/.—Two apertures communicating 
with the interior of the cylinders C. C. 
These apertures are alternately opened and 
closed by sliding-valves worked by a verti- 
cal arm connected with the rods G.G. 
M.M’.—A pipe communicating with the 
two cylinders for the purpose of admitting 
atmospheric air atter the vacuum has been 
effected and the water raised. This pipe 
has two apertures at N, which become 
alternately opened and shut by the sliding 
valve n, which is worked by a crank and 
chain connected with the floats in the wa- 
ter-chambers. 
O.—A trough into which the water is 
discharged from each cylinder in succession. 
This trough empties itself into the buckets 
of a water-wheel Q; or in the absence of 
the water-wheel, into the tank below. 
In order to set this engine in ac- 
tion, nothing more is necessary, than 
to turn on the gas by the stop-cocks of 
the pipes I. and K., and light the orifices 
of the minor pipe at L.L. Suppose the 
beam to be in eqnilibrio—by pressing 
down one of the cylinder caps on the 
head of the cylinder, the opposite end 
of the beam will become elevated, and 
by means of the rod G. will open the 
sliding valve in the side of the cylinder 
C.,and at the same instant open the 
stop-cock of the gas-pipe I.; when the 
gas will immediately rush into the lower 
part of the cylinder and become in- 
ayently ignited from the gas flame at 
aL. 
But the upward motion of the beam- 
end A also opens the sliding valve v 
(which covered the orifice of the pipe P), 
New Patents and Mechanical Inventions. 
167 
so as to allow the atmospheric air to 
act on the surface of the water in the 
tank and chamber e. 
The combustion of the gas in the 
cylinder being effected, and the flame 
having produced a vacuum; the atmos- 
pheric pressure on the surface of the 
water below forces it through the pipe 
P. into the main E. and cylinder D, and 
over the top rim of the interior cylinder 
C. filling the whole of the interior cy- 
linder. But whilst the water is passing 
up the pipe and main, it also drives up- 
ward the float F; which by its rod G. 
forces up the end of the beam, and of 
course brings down the opposite end so 
as to close the cylinder with the cap B. 
air tight. It is therefore the extinction 
of the flame by closing the top of the 
cylinder, which actually produces the 
vacuum ; whilst at the same instant the 
water from below rushes up with vast 
rapidity to fill its space in the cylinder : 
at the same time driving out the car- 
bonic acid gas of the combustion, by 
means of the small valves in the cover 
opening outwards. The water is dis- 
charged from the cylinder into the 
trough, by admitting the atmospheric air 
through the horizontal pipe M. This 
is effected by the minor beam drawing 
the slider of the valve at N. imme- 
diately the cylinder becomes filled with 
water. The air rushing in, relieves the 
pressure on the cap B. and allows the 
reciprocal action of the beam and floats 
to proceed for the alternate stroke ; 
whilst the water by its own gravity 
descends from the cylinder through the 
pipe and trough, to be applied to a 
water wheel or any other arrangement 
requisite for economical purposes. 
From the silent action of this engine, 
the spectator is in a measure surprized 
at the powerful effects produced. And 
it is only by an inspection of the mer- 
curial gauge attached to the engine, that 
he can imagine the vacuum effected 
(and consequently the power gained. by 
the correspondent pressure of the air) 
to be so great as it is in reality. It is 
not probable that the stop-cocks, valves, 
&ec., of this which is only a model- 
engine, are so pertect as they might be 
made by the workmanship of our excel- 
lent engineers of the present day: yet 
Mr. Brown at present produces a va- 
cuum = twenty-two inches of mercury 
by the guage. And this being equal to 
a reduction of eleven-fifteenths ot the 
atmospheric pressure, it is not impro- 
bable that, when these engines become 
constructed with every attention to the 
workmanship 
