IMPROVEMENTS IN THE MANUFACTURE OF GAS
Year: 1844

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, we, BAPTISTE
BURET, Merchant, and FRANCOIS MARIUS DAVID, Manufacturer of Ga
Apparatus, both of Leicester Square, in the County of Middlesex, send
greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Letters Patent under the Great Seal of Great Britain, bearing date at West-
minster, the Thirtieth day of January, in the seventh year of Her reign, did, for
Herself, Her heirs and successors, give and grant unto us, the said Baptiste
Buret and Francois Marius David, Her especial licence, full power, sole
privilege and authority, that we, the said Baptiste Buret and Francois Marius
David, our exors, adiñors, and assigns, or such others as we, the said Baptiste
Buret and Francois Marius David, our 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 Town of Berwick-upon-Tweed, our
Invention of "IMPROVEMENTS IN THE MANUFACTURE OF GAS;" in which said
Letters Patent is contained a proviso, that we, the said Baptiste Buret and
Francois Marius David, or one of us, shall cause a particular description of the
nature of our said Invention, and in what manner the same is to be performed,
to be inrolled in Her 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.

page_text: NOW KNOW YE, that in compliance with the said proviso, we, the said
Baptiste Buret and Francois Marius David, do hereby declare that the nature
of our said Invention, and the manner in which the same is to be performed,
are fully described and ascertained in and by the following statement thereof,
reference being had to the Drawings hereunto annexed, and to the figures
and letters marked thereon (that is to say):-
Our Invention consists in the construction of the retorts used in the manu-
facture of gas in such manner as to expose the matters operated upon to a
greater surface of heat, and in combining apparatus for the manufacture of gas.
But in order that the Invention may be more clearly understood, we will
proceed to describe the Drawings hereunto annexed, first observing that the
materials we employ to obtain the gas are all fatty bodies that are capable of
being rendered liquid by heat, such as oils, pitch, tar, naptha, resins, tallow,
and such like matters.
DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side view of the apparatus; Figure 2 is a section of the same;
and Figure 3 is a plan. 1 is a retort; the retort may be made of iron or clay,
but we prefer to use clay retorts as they will be found more economical. The
retort has a dividing plate 2, extending nearly to the bottom of it; 3 represents
the coke; 4 is a tube through which the fatty matters drop into the retorts and
mix with the coke, and 5 the tube through which the gas escapes into the
condenser; 6, the reservoir to contain the fatty matter to supply the retorts;
7 shews the space for the fire to pass up and around in order to heat the
retort and also the reservoir 6, as shewn at 8, in order to keep the fatty
matters therein in a liquid state ready to supply the retort as required. 9 is
the furnace door; 10, the chimney; 11 shews the brickwork of the furnace;
12, a glass tube to ascertain the quantity of fatty matters remaining in the
reservoir 6; 13 is the top of the retort; 15, the worm or refrigerator for the
purpose of cooling the gas as it passes from the retort into the washing
chamber 16; this chamber has a division 17, in which are placed small pieces
of heath wood through which the gases pass from the washing chamber to the
gasometer; 18 is a tube shewing the level of the water in the water chamber;
19 is the gasometer, into which the gas passes after having been purified by
passing through the chamber 17; 20 is a safety valve on the top of the retort;
21 is the tube which conveys the gas from the chamber 17 into the gasometer;
22 the tube which conveys the gas to the place where it is to be burnt.
In the Drawing only one retort is shewn, but any number may be arranged.
If required the gas may be perfumed as it passes from the retort by mixing
with it any suitable essence.

page_text: Having described the nature of the Invention, and the manner of performing
the same, we would have it understood that we do not claim the manufacturing
of gas from tar, oil, and such like matters, nor do we confine ourselves to the
precise details of the apparatus herein described so long as the peculiar arrange-
ment be retained; but what we claim is, the mode of constructing retorts and
combining apparatus for the manufacture of gas as herein described.
In witness whereof, the said Francois Marius David, have hereunto set
hand and seal, this Twenty-seventh day of July, in the year of our Lord
One thousand eight hundred and forty-four.