CERTAIN IMPROVE- MENTS IN GAS APPARATUS
Year: 1835

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, ALEXIS
DUMOULIN, of Leicester Square, in the County of Middlesex, Merchant, send
greeting.
WHEREAS His present most Excellent Majesty King William the
Fourth, by His Letters Patent under the Great Seal of Great Britain,
bearing date at Westminster, the Nineteenth day of May, in the fifth year of
His reign, did, for Himself, His heirs and successors, give and grant
unto me, the said Alexis Dumoulin, His especial licence, full power, sole
privilege and authority, that I, the said Alexis Dumoulin, my exors, adñiors,
and assigns, or such others as I, the said Alexis Dumoulin, my exors,
admors, or assigns, should at any time agree with, and no others, from time
to time and at all times during the term of years therein expressed, should
and lawfully might make, use, exercise, and vend, within England, Wales,
and the Town of Berwick-upon-Tweed, my Invention of "CERTAIN IMPROVE-
MENTS IN GAS APPARATUS;" in which said Letters Patent is contained a
proviso that I, the said Alexis Dumoulin, shall cause a particular descrip-
tion of the nature of my said Invention, and in what manner the same is to
be performed, to be inrolled in His said Majesty's High Court of Chancery
within six calendar months next and immediately after the date of the said in
part recited Letters Patent, as in and by the same, reference being thereunto
had, will more fully and at large appear..
NOW KNOW YE, that in compliance with the said proviso, I, the said
Alexis Dumoulin, do hereby declare the nature of my Invention, and the

page_text: manner in which the same is to be performed, are fully described and ascer-
tained in and by the following description thereof, reference being had to the
Drawing hereunto annexed, and to the figures and letters marked thereon,
that is to say:-
My Invention consists of a portable gas apparatus so arranged and com-
bined that the flame which gives off light is at the same time producing a
supply of gas for further combustion.
DESCRIPTION OF THE DRAWING.
The apparatus, as shewn in section in the Drawing, is combined into the
form of an ordinary table lamp, and is intended for that purpose. A, a vessel
or retort in which the gas is produced by the heat of the flame proceeding
from the burner. B is a tube or pipe connected at one end to the oil
chamber I, and at the other end to the vessel or retort A, there being a stop-
cock N on the pipe or tube B to regulate the supply of oil or to shut it off
altogether when desired. O is a capilary tube proceeding from the pipe B.
C is a pipe proceeding from the retort or vessel A to the condenser D, which
is a flat vessel surrounded by water. E is a syphon pipe proceeding from the
condenser D into the vessel S, which contains water for the gasometer F, which
is a small inverted vessel to receive the gas as it is generated. G is a pipe
leading from the gasometer up to the burner Q. K is a chamber containing
water with sulphate of zinc for the purpose of forcing up the oil from the
chamber I, the chambers I and K being open to each other by the pipe L;
and M, the portion of the apparatus which contains water to condense the
gas.
Having thus described the manner of combining the various parts, I would
remark that I have not though it necessary to show in the Drawing the means
of introducing water, oil, and materials into the parts I, K, M, and S, as they
will be readily applied by any workman competent to make the other parts of
the apparatus.
action of the various parts. In
and R are open and that the oil is
I will now proceed to describe the
doing so, I will suppose that the cocks N
being forced into the retort or vessel A by the pressure generated in the
chamber K; if heat be applied to the retort or vessel A by a small hand lamp
or otherwise for a few minutes, gas will be quickly produced, and passing
down the pipe C, will fill the gasometer F, when by opening the cock H and
a light being applied at Q will ignite the gas flowing up thereto, the flame of
which will continue the production of gas by its heat acting on the retort or
vessel A.

page_text: I would remark, that it will have become evident that the various parts
may be combined into other devices, and one light may be made to generate
gas for more burners than one. I do not, therefore, confine my claim of
Invention to the precise arrangement shown in the Drawing, nor do I confine
myself to the making my improved apparatus of any particular material, pro-
vided the property of a portable gas apparatus so arranged and combined that
the flame which gives off light is at the same time producing a supply of gas
for further combustion, but I do not claim any of the parts separately, of which
the apparatus is composed.
In witness whereof, I, the said Alexis Dumoulin, have hereunto set my
hand and seal, this Fifteenth day of September, in the year of our
Lord One thousand eight hundred and thirty five