Improvements in and relating to Apparatus for Carburetting Gas.
Year: 1889

page_text: This Print is in accordance with the Original Specification as it stands after
Amendment (under Section 18 of the Patents, &c., Act, 1883), as allowed
by the decision of the Chief Examiner of the 24th day of August 1896.
Date of Application, 14th Jan., 1889
Complete Specification Left, 18th Sept., 1889-Accepted, 26th Oct., 1889
PROVISIONAL SPECIFICATION.
Improvements in and relating to Apparatus for Carburetting Gas.
I, HIRAM STEVENS MAXIM, of Crayford Works, Crayford, in the County of Kent,
Mechanical Engineer, do hereby declare the nature of this invention to be as follows:-
My invention relates to carburetting apparatus, chiefly designed for enriching coal-
gas. My improved apparatus is, however, also applicable for carburetting atino-
spheric air and other gases.
The main object of my said invention is to provide for the manufacture of
carburetted coal-gas in proportion to the consumption thereof, in such a manner as to
ensure its being of equal or uniform density, notwithstanding any variations in the
number of burners in use, the length of time during which such burners are used, tho
quality of the liquid hydrocarbon employed, or the temperature of the surrounding air.
My said invention is further designed to provide for the use of gasoline or other
hydrocarbon of different qualities in such a manner that this material is not deterior-
aled, that is to say, so that the heavy and light portions being vaporized will pass
together into the mixing chamber and the residue will not become deteriorated or
heavier.
In carburetting apparatus, as heretofore constructed, in which heat is employed for
vaporizing the hydrocarbon, there is great liability to overheating of the hydrocarbon
and consequent carburetting of the gas to a degree far above that which is desired.
Morcover the attendant is liable to forget to shut off the steam or other heating
medium when the flow of gas through the apparatus has been arrested; the result is
that great pressure is generated in the carburettor sometimes with the effect of
bursting the same, and in any case driving into the pipes, large quantities of the
vapour, which flows out and condenses. Great difficulty has also been experienced in
so regulating the beat that it shall just counteract the refrigeration due to evaporation.
In my improved apparatus, no hydrocarbon vapour can pass into the mixing
chamber except when gas to be carburetted is flowing into and through the apparatus;
there is no risk of condensation in the pipes, because the gas will not be too strongly
carburetted. Any given quantity of gas passing through the apparatus, allows the
corresponding quantity of hydrocarbon vapour to be combined with it.
In my apparatus, moreover, the mixture is not made by exposing the liquid
hydrocarbon to the action of the gas; the hydrocarbon is first vaporized in one
chamber and the required quantity of vapour is combined with the gas in another
chamber. I am therefore enabled to make carburetted gas of much superior quality
than that obtained by the method usually adopted, and the hydrocarbon used is not
deteriorated.

page_text: An important feature of my said invention is the employment of a gasometer or its
equivalent which is so arranged that it will regulate or control the flow of gas through
the apparatus and also the admission of the hydrocarbon vapour into the mixing
chamber, according to the amount of arburetted gas consumed, and which is, in somo
instances, also arranged to regulate or control the supply of gas to a burner for
heating the vaporizing or hydrocarbon chamber.
Another feature of my said invention is the arrangement of the vaporizing or
hydrocarbon chamber in combination with a tank for the supply of liquid bydro-
carbon thereto, in such a manner that no pressure will be produced in the said
chamber except by the vaporization of the hydrocarbon, and so that no liquid hydro-
carbon will be caused to pass through the aperture for the admission of the
hydrocarbon vapour to the mixing chamber.
My said invention, moreover, comprises other improvements hereinafter set forth.
My said invention is conveniently and advantageously carried into practice as
follows, viz. provide a gasometer or gas-holder of thin sheet-metal which is
perforated for the purpose hereinafter explained, and is arranged to move freely up
and down in an annular chamber filled with mercury or other suitable fluid; this
annular chamber may be very narrow so that the quantity of mercury required is not
great. A suitable casing is provided which encloses the gasometer and forms the
upper chamber of the apparatus. A stem or spindle is attached to the gasometer and
is fitted to slide freely in the upper end of the vaporizing or hydrocarbon chamber.
This chamber is connected by a pipe with a reservoir or tank for the supply of the
gasoline, naphtha or other hydrocarbon, which tank may be situated at any convenient
distance from the machine; the top of the tank, however, should be at such a level as
to prevent the flow of liquid hydrocarbon through the opening in the upper end of
the said hydrocarbon chamber into the mixing chamber. By having the tank situated
at a distance from the heating apparatus, great safety in the use of the apparatus is
ensured; only a small quantity of hydrocarbon need be kept in or near the building
to be lighted, the tank being placed at a safe distance therefrom.
The gasoline or other liquid hydrocarbon in the tank should not be under pressure,
it should be exposed to the air and connected by a pipe to the gas supply pipes, so
that, as the gasoline flows out, the gas will enter, and vice versa.
The
The gasoline will enter the hydrocarbon chamber until it attains the same level as
that in the tank, the said tank should be large and shallow so that the level of the
gasoline will not vary greatly in the said chamber. The said chamber being thus
filled with gasoline, is heated by an argand burner or by other suitable means.
flame or products of combustion rising upward, impinge against a ring or annular
piece surrounding the said chamber, and pass through an aperture in the said annular
piece on one side of the hydrocarbon chainber into a casing or jacket around the said
chamber they then ascend and pass over a partition which divides the said casing
from the bottom nearly to the top thereof, and descend on the other side of the hydro-
carbon chamber and finally pass out of the said casing at the lower end thereof above
the aforesaid annular piece.
The heat evaporates the gasoline and the pressure thus generated forces the liquid
gasoline downward in the chamber and causes some of it to flow back into the tank.
The burner for heating the said chamber is supplied with gas through a pipe which
extends to the said burner from the mixing chamber of the apparatus. This chamber
is provided with an inlet for the gas to be carburetted and the upper chamber of the
apparatus is provided with an outlet for the carburetted gas.
When the carburetted gas is used, the pressure of gas entering through the inlet
raises the gasometer until a certain number of the aforesaid holes therein arc above
the surface of the mercury so that the carburetted gas may pass through the said holes.
The greater the number of holes above the surface of the mercury, the greater will be
the quantity of carburetted gas that passes to the burners.
As the gasometer rises and opens the holes for the passage of the carburetted gas, it
also raises the spindle attached to it, and thus correspondingly opens the passage for
the vapour of the gasoline from the hydrocarbon chamber into the mixing chamber,

page_text: the said spindle being triangular or of other suitable form in transverse section and the
opening in which it works being circnlar. The holes in the gasometer must be so
made as to bear a certain relation to the opening for the passage of the vapour from
the hydrocarbon chamber into the mixing chamber, so that the quantity of gasoline
vapour admitted to the said mixing chamber will always be suitably proportionate to
the quantity of gas passing through the apparatus. If the said holes were too large,
the gasometer would rise but slightly and only a small quantity of vapour would be
admitted to the mixing chamber. On the contrary, if the holes were very small, the
gasometer would rise too high and too large a quantity of the gasoline vapour would
be admitted.
In order to control the flame of the argand burner, that is to say, to make the said
flame larger or smaller according to the quantity of carburetted gas being consumed,
I provide a suitable valve in the upper end of the pipe for the supply of gas to the
said burner, which valve is also attached to and operated by the gisometer. When a
large quantity of carburetted gas passes from the apparatus, the gisometer ascends,
thus raising the required number of holes therein above the level of the mercury and
at the same time opening the aperture for the admission of gasoline vapour to the
mixing chamber and also the passage for the gas to descend through the pipe to
the argand burner.
If all the burners for consuming the carburetted gas are closed, the gasometer
descends until all of the holes therein are below the surface of the mercury, and, at
the same time, an enlarged portion of the aforesaid spindle enters the opening in
the hydrocarbon chamber, and shuts off all communication with the gasoline vapour
supply, and the aforesaid valve closes the supply to the argand burner until only sufficient
gas can pass to keep it alight. It will, therefore, be seen that the apparatus is
completely automatic, and the greater the quantity of gas consumed, the greater will
be the amount of gasoline vapour admitted to the mixing chamber and the greater the
quantity of gas allowed to flow to the argand burner.
If desired the valve is allowed to completely close the supply-pipe of the argand
burner and in order to light it again, a small auxiliary burner is used, which is only
large enough for the purpose of igniting the gas when allowed to pass through the
large burner. Therefore when the apparatus is not in use, it will cool completely and
no gas except that required for the aforesaid auxiliary burner will be consumed.
When, however, the burners to be supplied with carburretted gas are in use, the
gasometer will ascend, the argand burner will receive gas to be ignited from the
auxiliary burner and pressure will soon be produced in the hydrocarbon chamber
by the heating of the hydrocarbon. The liquid gasoline will descend by the
pressure generated by the formation of the vapour, when the rich vapour will again
pass through the opening in the hydrocarbon chamber and will unite with the
illuminating gas entering at the inlet.
1 do not confine myself to the special form of construction hereinbefore described.
In some instances I dispense with the gasometer and substitute therefor a piston
working freely in a cylinder. Or I use a valve which in opening has to travel a con-
siderable distance. The opening for the passage of gasoline vapour to the mixing
chamber is sometimes controlled by other means than those hereinbefore described.
It is obvious that my improved apparatus is applicable for carburetting atmospheric
air or other gas.
DL LLA
11
1000

page_text: Improvements in and relating to Apparatus for Carburetting Gas.
I, HIRAM STEVENS MAXIM, of Crayford Works, Crayford, in the County of Kent,
Mechanical 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 :-
My invention relates to carburetting-apparatus, chiefly designed for enriching coal-
gas. My improved apparatus is, however, also applicable for carburetting atmospheric
air and other gases.
The main object of my said invention is to provide for the production of carburetted
coal-gas in proportion to the consumption thereof, in such a manner as to ensure its
being of equal or uniform richness or density notwithstanding any variations in the
number of burners in use, the length of time during which such burners are used, the
quality of the liquid hydrocarbon employed or the temperature of the air around
the apparatus.
the
My said invention is further designed to provide for the use of gasoline or other
hydrocarbon of different qualities or of different degrees of specific gravity, in such a
manner that the residue of hydrocarbon will not be deteriorated, that is to say,
heavy and light portions of the liquid hydrocarbon will be vaporized and will pass
together into a mixing-chamber in which the vapour will be mixed with the gas to be
carburetted, and the residue of unvaporized hydrocarbon will not become deteriorated
or heavier.
By my invention, moreover, I am enabled to employ heavier and cheaper qualities of
hydrocarbon than liave heretofore been used for carburetting gas.
In carburetting-apparatus as heretofore constructed, in which heat is employed for
vaporizing the hydrocarbon, there is great liability to overheating of the hydrocarbon
and consequent carburetting of the gas to a degree far above that which is desired.
Moreover, the attendant is liable to forget to shut off the heating medium when the
flow of gas through the apparatus has been arrested; the result is that great pressure
is generated in the carburettor, sometimes with the effect of bursting the same, and in
any case driving into the pipes large quantities of vapour, which condonse therein.
My improved apparatus is so constructed that no hydrocarbon-vapour can pass into
the mixing-chamber except when gas to be carburettod is flowing into and through
the apparatus there is no risk of condensation in the pipes, because the gas will not
be too strongly carburetted, any given quantity of gas which passes through the
apparatus allowing the corresponding quantity of hydrocarbon-vapour to be mixed
with it.
In my apparatus, moreover, the mixture is not made by exposing the liquid hydro-
carbon to the action of the gas; the hydrocarbon is first vaporized in one chamber and
the required quantity of vapour is mixed with the gas in another chamber. I am,
therefore, enabled to make carburetted gas of uniform quality much superior to that
obtained by the methods usually adopted for producing the same.
An important feature of my said invention is the employment of a gasometer, piston
or equivalent device which is suspended in, or acted upon by, the gas, and is so
arranged that it will regulate or control the flow of gas through the apparatus and
also the admission of the hydrocarbon-vapour into the mixing-chamber according to
the amount of carburetted gas consumed. The said device is, in some cases, also
arranged to regulate or control the supply of gas to a burner or burners for heating
the vaporizing or hydrocarbon chamber.
Another feature of my said invention is the arrangement of the vaporizing or hydro-
carbon chamber in connection with a tank for the supply of liquid hydrocarbon
thereto, in such a manner that no pressure will be produced in the said chamber
except by the vaporization of the hydrocarbon, and the pressure therein can never

page_text: exceed that due to the head of hydrocarbon liquid in the reservoir connected therewith,
and so that no liquid hydrocarbon can pass through the aperture for the admission of
the hydrocarbon-vapour to the mixing-chamber, the level of the liquid hydrocarbon in
the tank being below the said aperture.
My said invention, moreover, comprises other improvements hereinafter set forth.
In the accompanying drawings
Figure 1 is a vertical central section of one form of my improved carburettor.
Figure 2 is a transverse section on the line a, a, Figure 1.
Figure 3 shows, in vertical central section, drawn to an enlarged scale, a portion of
a gasometer hereinafter described.
Figure 4 is a horizontal section on the line ', ', Figure 1, and
Figure 5 a horizontal section on the line .,, Figure 1, both drawn to a still
further enlarged scale, illustrating a regulating-valve hereinafter described.
Figure 6 is a sectional elevation, drawn to a reduced scale, illustrating the tank or
reservoir for the liquid hydrocarbon and the manner of connecting the carburettor
therewith.
Like letters indicate corresponding parts throughout the drawings.
a is a chamber or casing which is closed at its upper end by a cover a', and to the
lower end of which is firmly secured the mixing-chamber b. The part of the said
mixing-chamber extends upward within the chamber or casing a, thus forming
between the walls of the said chambers, an annular space e, which is filled, or partly
filled, with mercury or other suitable liquid. This annular space is preferably made
very narrow so that the quantity of mercury required is not great.
dis a gasometer or gas-holder of thin sheet-metal having numerous perforations d',
or slots, for the purpose hereinafter explained. This gasometer or gas-holder is
arranged to move freely up and down in the annular space c containing the mercury.
The mixing-chamber bis provided with an inlet-pipe e for the admission of gas to
be carburetted; and the chamber a is provided with an outlet-pipe for the flow of
the carburetted gas to the burners or other devices for its consumption.
A vaporizing or hydrocarbon chamber g is firmly secured to the lower end of the
mixing-chamber, and the party' of the said vaporizing-chamber extends upward
within the mixing-chamber.
The extension g' of the vaporizing-chamber g is provided with a circular aperture g
for the passage of the hydrocarbon-vapour into the said mixing-chamber, the flow of
vapour through the said aperture being regulated or controlled as hereinafter described.
The said vaporizing or hydrocarbon chamber is connected by a pipe with a
reservoir or tank (as shown in Figure 6) for the supply of the liquid gasoline,
naphtha or other hydrocarbon. This tank may be situated at any convenient distance
from the carburettor; the top of the tank should, however, be at such a level as to
prevent the flow of liquid hydrocarbon through the opening 92 in the upper end of the
hydrocarbon chamber g into the mixing-chamber b, that is to say, the top of the tank
should be below the level of the said opening g².
A stem or spindle j is attached at its upper end to the gasometer d and is provided
at its lower end with a grooved part or valve arranged to slide freely up and down
in the aperture in the upper end of the vaporizing chamber g. The valve is made
with taper V-shaped grooves as shown more clearly in Figures 4 and 5, the said
grooves tapering from the lower end of the said valve to, or nearly to, the upper end
thereof so that, by raising or lowering the said valve in the circular aperture 9³, the
passage for the flow of hydrocarbon-vapour from the chamber g into the mixing-
chamber will be enlarged or reduced, and will be completely closed when the holes d
are below the level of the mercury, that is to say, when the gasometer d is at the lower
end of its stroke or movement. Any other suitable valve may, if desired, be substituted
for the said valvej for the purpose specified.
A casing or jacket is fitted on the lower end of the mixing-chamber band
surrounds the vaporizing-chamber g a suitable space being left between the said
chamber g and the casing to form a heating-chamber. A ring or annular piece

page_text: having in one portion or segment thereof a number of perforations is firmly.
secured between the said chamber g and casing k. Vertical partitions mare,
moreover, arranged between the chamber and the casing and extend from the
said ring or annular piece to near the top of the vaporizing-chamber g, so as to
divide the heating-chamber into two parts or flues communicating with each
other at their upper end. A burner is arranged within the casing or jacket k
and surrounds the chamber below the said ring or annular piece L. The lower
end of the said casing is left open for the admission of air to support the com-
bustion of the gas issuing from the said burner, and holes for the escape of
the products of combustion from the said burner, are formed in the said casing k
at the lower end of the heating-chamber and on the opposite side of the
partition m to that on which lie the holes .
By the construction of heating-apparatus in this manner, I provide for preventing
the passage of currents of cold air through the flues after the supply to the burner las
been cut off, that is to say, there will then be in the said flues columns of heated air of
equal height; these columns will counterbalance each other and, there being no
aperture for the escape of the heated air at the upper end of the flues, there will be
practically no flow of air through the said flues except when heat is applied to the
column of air in one of the same. It is obvious that there may be more than two
flues in my improved heating-apparatus, the columns of air in two or more of the said
flues being counterbalanced by the columns of air in the remaining flues.
The burner is supplied with gas from the mixing-chamber through a pipe o
provided with a cock o' and connected with another pipe p which extends upward
within the said mixing-chamber b.
To provide for the automatic control of the supply of gas to the burner n so that the
flame will be enlarged or diminished according to the quantity of carburetted gas
being consumed, a taper rod or valve g is attached to a collar on the spindle j and
is arranged to slide freely up and down in the upper end of the pipo p for the supply
of gas to the said burner, so that the said valve will be operated by the gasometer d.
The tank for containing the liquid hydrocarbon is, as above stated, connected by
the pipe with the vaporizing-chamber g. The said pipe h is provided with a valve ¹
for shutting off communication between the said tank and the vaporizing-chamber.
The said pipe is, moreover, connected by another pipes with the top of the supply-
tank r so that, should heat be applied to the vaporizing-chamber while the valve ¹
is closed, the liquid hydrocarbon may flow from the said chamber through the said
pipes into the tank, thus preventing the raising of the pressure in the vaporizing
chamber above that due to the head of liquid in the tank or in the pipe s.
The gasoline or other liquid hydrocarbon in the tank should either be exposed to
the atmospheric pressure, or the tank should be closed and connected by a pipet to the
supply pipe for the carburetted gas, so that, as the gasoline flows out of the tank,
the gas will enter the same, and vice versa, thus ensuring an approximate balance of
pressure throughout the apparatus. The gasoline will enter the hydrocarbon-chamber
until it attains therein the same level as that in the tank; the said tank should be
large and shallow so that the level of the gasoline will not vary greatly in the said
chamber.
By having the tank situated at a distance from the heating-apparatus, great safety
in the use of the apparatus is ensured, as only a small quantity of hydrocarbon need
be kept in, or near, the building to be lighted, the tank being placed at a safe distance
therefrom.
The operation of the apparatus is as follows, viz. :-The vaporizing-chamber after
being filled, or partly filled, with the liquid gasoline or other hydrocarbon, is heated by
means of the burner n; the flame or products of combustion ascending from the said burner,
impinge against the ring or annular piece and pass through the holes therein, into
the heating-chamber on one side of the chamber 9 and partitions m, they then
ascend and pass over the partitions m and descend on the other side of the said
partitions and the chamber g, and finally pass out of the casing k through the holes *³.

page_text: The heat evaporates the gasoline and the pressure thus generated forces the liquid
gasoline downward in the chamber g and causes some of it to flow back into the tank.
When the pressure above the gasometer is diminished by the consumption of the
carburetted gas, the pressure of the gas entering through the inlet e raises the
gasometer d until a greater or less number of its holes are above the surface of
the mercury in the space c, so that the carburetted gas may pass from the mixing-
chamber & through the said holes. The greater the number of holes above the surface
of the mercury, the greater will be the quantity of carburetted gas allowed to pass to
the burners or other devices for consuming it. As the gasometer rises and opens the
holes for the passage of the carburetted gas, it also raises the spindle j and thus
correspondingly opens the passage g² for the flow of the hydrocarbon-vapour from the
chamber g into the mixing-chamber 6, and, at the samo time, correspondingly opens
the passage for the carburetted gas from the mixing-chamber to the burner n through
the pipes p and o.
and
When the burners for consuming the carburetted gas are closed and there is
consequently no flow of gas through the apparatus, the gaso.neter descends until all of
the holes therein are below the surface of the mercury, and the cylindrical portion of
the spindle closes the aperture at the upper end of the hydrocarbon-chamber
thus shuts off the supply of hydrocarbon-vapour to the mixing-chamber b, and the
valve nearly closes the supply to the burner, so that only sufficient gas can pass
through the pipe p to keep the flame of the said burner alight. It will, therefore, be
seen that the apparatus is completely automatic in its action, and the greater the
quantity of gas consumed, the greater will be the amount of hydrocarbon-vapour
admitted to the mixing-chamber and the greater the quantity of gas allowed to flow
through the gasometer to the outlet-pipe and through the pipe p to the burner n.
The holes in the gasometer d must be so made as to bear a certain relation to the
opening for the passage of the vapour from the hydrocarbon-chamber into the
mixing-chamber, so that the quantity of vapour admitted to the said mixing-chamber
will always be suitably proportionate to the quantity of gas passing through the
apparatus. If the said holes were too large, the gasometer would rise but slightly,
and only a small quantity of vapour would be admitted to the mixing-chamber. On
the contrary if the holes were very small, the gasometer would rise too high and too
large a quantity of the gasoline-vapour would be admitted.
If desired, the valve q is allowed to completely close the pipe for the supply of
gas to the burner n, and, in order to ignite the gas when it issues from this burner,
a small auxiliary burner is used, which is only large enough for this purpose; therefore,
when the apparatus is not in use, it will cool completely and no gas except that
required for the aforesaid auxiliary burner will be consumed. When, however, the
burners to be supplied with carburetted gas are in use, the gasometer will ascend, the
burner will receive gas to he ignited by the flame from the auxiliary burner, and
pressure will be produced in the hydrocarbon-chamber by the heating of the hydro-
carbon therein. The liquid hydrocarbon will descend by the pressure generated by
the formation of the vapour and some of it will be forced back into the tank, and the
rich vapour will then pass through the opening in the hydrocarbon-chamber and will
unite with tho gas entering at the inlet e as herein before described.
By varying the level of the mercury in the annular chamber c, the density of the gus
may be varied as required. I sometimes provide a T-piece one branch of which is
fixed in an aperture in the chamber or casing a. The other branches of the said
T-piece are tightly closed by plugs u'. If it is desired to raise the level of the mercury
in the annular chamber or space c, the upper plug u' is removed and mercury is
introduced through the T-piece u. If on the other hand it is desired to lower the
level of the mercury, the lower plug u' is wholly or partially withdrawn to permit the
escape of a quantity of the mercury sufficient to bring down the level as required.
I find it advantageous to arrange the holes in the gasometer d as shown niore clearly
in Figure 3, that is say, in three or any other suitable number of triangular series
or groups, the apex of each triangular group being uppermost. The area of the holes

page_text: in the gasometer and the transverse sectional area of the grooves in the valve jª must,
as above stated, be so calculated that the richness of the gas will not vary as the
gasometer rises and falls.
It will be seen from the foregoing description that, by my invention, I provide a
carburettor which will operate continuously and in which the regulation is auto-
matically effected. Moreover, during the operation of the apparatus, the liquid hydro-
carbon is constantly flowing from the tank into the vaporizing chamber; therefore
notwithstanding variations in the specific gravity of the hydrocarbon used from time
to time, practically the whole of the hydrocarbon supplied to the vaporizing-chamber
will be vaporized.
I do not confine myself to the special form of construction hereinbefore described.
In some instances, I dispense with the gasometer and substitute therefor a piston
working freely in a perforated cylinder or I use a valve which, in opening, has to
travel a considerable distance. The gasometer may, if desired, be provided with
elongated slots instead of with holes as shown. Moreover the opening for the passage
of hydrocarbon-vapour to the mixing-chamber may be controlled by means other than
those hereinbefore described but which operate in an equivalent manner.
It is obvious that my improved apparatus is applicable for carburetting atmospheric
air or other gas.
I am aware that it has been heretofore proposed to regulate the flow of vapour
from the vaporizing chamber according to the consumption or flow of the carburetted
gas by a device whose operation depends on the quantity of gas accumulated. I do
not desire to claim any such device, but I desire to confine my claims to apparatus
in which the flow of vapour is regulated by the action of the varying pressures on
the inside and outside of the gasometer or equivalent device produced by the varying
flow of carburetted gas in the manner hereinbefore described. Moreover I desire it
to be understood that I do not use the word gasometer in this specification in its
broad popular sense as a reservoir of gas, but merely as deuoting a chamber through
which the gas passes, such as is hereinbefore referred to.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed, I wish it understood that I
claim subject to the disclaiming note :—
First. A carburettor wherein a vaporizing-chamber is combined with a mixing-
chamber from which the carburetted gas may be continuously drawn off, and in which
provision is made for regulating or controlling the flow of vapour from the said
vaporizing-chamber into the mixing-chamber according to the consumption of the
carburetted gas, substantially in the manner herein before described.
Second. A carburettor provided with a perforated gasometer, or a piston working
in a perforated cylinder, or an equivalent device suspended in, or acted upon by the
gas for the purpose of regulating or controlling the flow of hydrocarbon-vapour
to a mixing-chamber such as aforesaid, according to the quantity of gas flowing
through the said chamber, substantially as hereinbefore described.
Third. The combination, with the mixing-chamber, the gasometer, the vaporizing-
chamber, and the burner for heating the same, of a pipe extending from the mixing-
chamber to the said burner and provided with a regulating-valve connected with the
said gasometer, arranged and operating substantially as, and for the purposes, set
forth.
Fourth. The combination, with the vaporizing chamber, of the jacket or casing
provided with the ring or annular piece having the segmental series of perforations,
and the partitions dividing the space between the said jacket or casing and the
vaporizing-chamber, substantially as, and for the purposes, above specified.
Fifth. The employment, in a carburettor, of a gasometer having holes or slots in
the cylindrical shell thereof and partially immersed in mercury contained in an annular
chamber surrounding the upper end of the mixing-chamber, arranged and operating
substantially as, and for the purposes, sot forth.

page_text: Sixth. The combination, with a carburettor, of a reservoir or tank connected with
the vaporizing chamber thereof and with the outlet-pipe for the carburetted gas,
substantially as, and for the purpose, above specified.
Seventh. The improved carburettor constructed substantially as described with
reference to either of the forms or modifications illustrated in the accompanying
drawings and operating as, and for the purposes, above specified.
Dated this 17th day of September 1889.
D. Young & Co.,
HIRAM S. MAXIM.
11 & 12 Southampton Buildings, London, W.C., Agents for the Applicants.