Liquified Carbonic Acid Gas.
Year: 1886

page_text: Date of Application, 22nd Sept., 1885
Complete Left, 22nd June, 1887.
Complete Accepted, 22nd July, 1887
Liquified Carbonic Acid Gas.
I FREDERICK FOSTER of Niagara Works Eagle Wharf Road London in the
County of Middlesex Engineer do hereby declare the nature of this invention to be
as follows:-
This invention relates to an automatic arrangement for supplying the gasometer of
a continuous action liquid aërating machine with carbonic acid gas.
In the specification of Patent N 8692 of the year 1885 I described a means of
supplying acid automatically into a generator for the production of carbonic acid gas
as required for maintaining the gasometer bell at a height within certain limits
according to the rate at which the gas is withdrawn from the gasometer.
By my present invention I supply the gasometer direct from a reservoir of com-
pressed or liquified carbonic acid gas in quantities as required to replace that which
is withdrawn from the gasometer by the action of the pump which draws a supply
of liquid and gas to be delivered to the cylinder or condenser in which the gas is
incorporated with the liquid.
For this purpose I attach to the draw off cock or valve of the reservoir of com-
pressed or liquified carbonic acid gas a spur wheel and a frame-work embodying a guide
in which a rack may be secured so as to move freely in a vertical direction engaging
with the said spur wheel.
The said rack is attached to a cord which has a balance weight at one extremity and
the gasometer bell at the other extremity and is conducted over pullies in the usual
manner so that the weight of the gasometer bell is counter balanced by the said
balance weight.
The position of the said rack is arranged so as to operate on the spur wheel in such
a manner that the draw off cock or valve of the reservoir of compressed or liquified
carbonic acid gas shall be completely shut off as soon as a convenient height for the

page_text: gasometer bell is reached and the effect of the descent of the gasometer bell is to
open the said cock or valve and thereby admit more gas to the gasometer bell until
the limit in height is again reached and so on in accordance with the requirements of
the pump of the liquid aerating machine.
Where it is required to obtain a more sensitive arrangement any of the known
forms of pressure reducing valves may be interposed between the reservoir of
compressed or liquified carbonic acid gas and an ordinary plug cock or other easily
controlled cock dealing with gas at the lower pressure to which the pressure reducing
valve may reduce the pressure of the gas given out by the reservoir of compressed or
liquified carbonic acid gas may be operated upon by a rack & spur wheel as above
described or by an ordinary lever handle on the plug of the cock attached at a
convenient point to the cord which connects the gasometer bell at one extremity with
the balance weight at the other extremity.
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page_text: Supplying the Gasometer of Continuous Action Liquid Aerating
Machines Automatically from a Reservoir of Compressed or
Liquified Carbonic Acid Gas.
I FREDERICK FOSTER of Niagara Works Eagle Wharf Road London in the
County of Middlesex Engineer do hereby declare the nature of this invention and in
what manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention relates to an automatic arrangement for supplying the gasometer of
a continuous action liquid aërating machine with carbonic acid gas.
In the Specification of Patent N° 8692 of the year 1885 I described a means of
supplying acid automatically into a generator for the production of carbonic acid gas
as required for maintaining the gasometer bell at a height within certain limits
according to the rate at which the gas is withdrawn from the gasometer.
By my present invention I supply the gasometer direct from a reservoir of
compressed or liquified carbonic acid gas in quantities as required to replace that
which is withdrawn from the gasometer by the action of the pump which draws a
supply of liquid and gas to be delivered to the cylinder or condenser in which the
gas is incorporated with the liquid.
For this purpose I attach to the draw off cock or valve of the reservoir of com-
pressed or liquified carbonic acid gas a spur wheel and a frame work embodying
a guide in which a rack may be secured so as to move freely in a vertical direction
engaging with the said spur wheel. The said rack is attached to a cord which has a
balance weight at one extremity and the gasometer bell at the other extremity and is
conducted over pullies in the usual manner so that the weight of the gasometer bell
is counterbalanced by the said balance weight.
The position of the said rack is arranged so as to operate on the spur wheel in such
a manner that the draw off cock or valve of the reservoir of compressed or liquified
carbonic acid gas shall be completely shut off as soon as a convenient height for the
gasometer bell is reached and the effect of the descent of the gasometer bell is to
open the said cock or valve and thereby admit more gas to the gasometer bell until
the limit in height is again reached and so on in accordance with the requirements of
the pump of the liquid aërating machine.
In order to make the operation more sensitive as the valves of some of the
reservoirs of compressed or liquified carbonic acid gas act more freely than others I
provide an intermediate valve placed between the outlet of the reservoir of compressed
or liquified carbonic acid gas and the inlet to the gasometer as shewn in the accom-
panying drawing in which
A is the gasometer tub.
B the gas holder or gasometer bell.
C the chain connected at one extremity with the balance-weight D and at the other
and with the ansomoter hall R

page_text: E is a cog wheel acted upon by the chain C in the same manner as the rack acting
upon a spur wheel as hereinbefore described so that when the gasometer bell B falls
below a predetermined height the spindle upon which the cog wheel E is placed is
turned round within the nut F which is provided with a screw thread and by that
means a valve is driven from its seating by the said spindle. The gas then passes
from the reservoir G by the draw off cock or valve H which is left permanently open
while the supply of gas to the gasometer bell B is controlled by the valve which is
driven from its seating whenever by the fall of the gasometer bell B the cog wheel
is rotated in one direction and is allowed to return to its seating when the cog wheel
is rotated in the opposite direction.
The cog wheel E is not rigidly connected with the spindle upon which it is placed
but is connected therewith by a friction clutch the tension of which is regulated by
a spring and thumb screw so that in case the amount of gas withdrawn from the
gasometer exceeds the supply when the controlling valve is full open, the gasometer
bell B can continue to descend turning the wheel E upon its spindle when the spindle
has been screwed up to its furthest point.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is
Controlling the supply of gas to the gasometer of a liquid aërating machine from
reservoirs of compressed or liquified carbonic acid gas by means of a valve operated
by the rise and fall of the gasometer bell substantially as herein before described and
illustrated by the accompanying drawing.
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