IMPROVEMENTS IN APPARATUS FOR ECONOMIZING THE CONSUMPTION OF GAS
Year: 1864

page_text: LETTERS PATENT to John Henry Johnson, of 47, Lincoln's Inn Fields, in
the County of Middlesex, Gentleman, for the Invention of "IMPROVEMENTS
IN APPARATUS FOR ECONOMIZING THE CONSUMPTION OF GAS."-A communi-
cation from abroad by Ernest Jourdan, of Paris, in the Empire of
France.
Sealed the 4th November 1864, and dated the 7th May 1864.
PROVISIONAL SPECIFICATION left by the said John Henry Johnson
at the Office of the Commissioners of Patents, with his Petition,
on the 7th May 1864.
I, JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of
Middlesex, Gentlemen, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN APPARATUS FOR ECONOMIZING THE CONSUMPTION OF GAS," a.
communication to me from abroad by Ernest Jourdan, of Paris, in the Empire'
of France," to be as follows:-
This Invention relates to an apparatus to be applied to any ordinary gas
burner, but more particularly to that description known as a "bat-wing,"
whereby a more intimate admixture of air with the gas at its exit is accom-
plished, thereby effecting a considerable economy of gas, and producing a
better light from a given quantity consumed. According to this Invention it
is proposed to adjust accurately over the aperture or apertures of the burner.
a piece of metallic or other wire gauze, capable of withstanding heat, the
gauze being so applied as to leave no free space or chamber intervening
between the burner and the gauze. The gauze may be fitted inside a

page_text: metallic or other cap provided with a slit or other suitable opening at the top
to allow the gas to pass through after passing through the gauze, such
cap being placed over and fitting accurately around the burner, and provided
with one or more projections or catches for the purpose of holding the same
securely in its place.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Henry Johnson in the Great Seal Patent Office on
the 4th November 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middlesex,
Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Seventh day of May, in the year of our Lord One
thousand eight hundred and sixty-four, in the twenty-seventh year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said John Henry Johnson, Her special license that I, the said
John Henry Johnson, my exécutors, administrators, and assigns, or such
others as I, the said John Henry Johnson, my executors, administrators, or
assigns, should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should and
lawfully might make, use, exercise, and 'vend, within the United Kingdom
of Great Britain and Ireland, the Channel Islands, and Isle of Man, an
Invention for "IMPROVEMENTS IN APPARATUS. FOR ECONONOMIZING THE CONSUMPTION
OF GAS," a communication to me from abroad by Ernest Jourdan, of Paris, in
the Empire of France, upon the condition (amongst others) that I, the said
John Henry Johnson, my executors or administrators, by an instrument in
writing under my hand and seal, or under the hand and seal of one of them,
should particularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause the same to
be filed in the Great Seal Patent Office within six calendar months next and
immediately after the date of the said Leters Patent.
NOW KNOW YE, that I, the said John Henry Johnson, do hereby
declare the nature of the said Invention, and in what manner the same
is to be performed, to be particularly described and ascertained in and by
the following statement, reference being had to the accompanying Drawings
and to the letters and figures marked thereon, that is to say:-

page_text: The said Invention relates to an apparatus to be applied to any ordinary
gas burner, but more particularly to that description, known as a "bat-wing"
whereby a more intimate admixture of air with the gas at its exit is accom
plished, thereby effecting a considerable economy of gas, and producing a
better light from a given quantity consumed.
According to this Invention it is proposed to adjust accurately over the
aperture or apertures of the burner a piece of metallic or other wire gauze,
capable of withstanding heat, the gauze being so applied as to leave no free
space or chamber intervening between the burner-and the gauze itself. The
gauze may be fitted inside a metal or other cap provided with a slit or other
suitable opening at the top to allow the gas to pass through, after passing
through the gauze, such cap being placed over, and fitting accurately around
the burner, and provided with one or more projections or catches for the
purpose of holding the same securely in its place.
And in order that the said Invention may be fully understood, I shall now
proceed more particularly to describe the same, and for that purpose I shall
refer to the several Figures on the Sheet of Drawings hereunto annexed, the
same letters of reference indicating corresponding parts in all the Figures.
Fig. 1, of the Drawings represents a side elevation of an ordinary "bat-wing"
burner; Fig. 2, is a sectional elevation of the wire gauze, and its cap or
support detached from the burner; Fig. 3, is a plan of the same; Fig. 4 is
a side elevation of a burner with the gauze and cap applied; Fig. 5 is a
sectional elevation showing the gauze and cap applied to a burner; and Fig. 6
is a similar view showing a slight modification of the mode of fixing the cap
on the burner. a is the burner, upon which is adjusted a close fitting cap b,
which serves to support or hold in its proper place over the burner the fine
wire gauge c, which is placed inside the cap. This gauge when adjusted in
its proper place fits closely over the orifice of the burner, as shown in the
sectional views in the Drawings. A slit or other opening, according to the
kind of burner employed, is formed in the cap to allow the gas to pass through
after permeating the wire gauze. The cap may either be pushed on to the
burner, as shown in Figs. 4 and 5, or it may be screwed thereon, as shewn in
Fig. 6, or fitted thereto in any other convenient manner.
Having now described and particularly ascertained the nature of the said
Invention and the manner in which the same is or may be used or carried
into effect, I would observe in conclusion that what I consider to be novel and
original, and therefore claim as the Invention secured to me by the herein-
before in part recited Letters Patent is, the application and use in
combination with a gas burner of a piece of metallic wire gauze or reticulated

page_text: fabric composed of any other suitable material placed immediatoly over and
in close contact with or proximity to the orifice of the burner, substantially as
and for the purpose herein-before described.
In witness whereof, I, the said John Henry Johnson, have hereunto set
my hand and seal, the Thirty-first day of October, One thousand
eight hundred and sixty-four.
J. HENRY JOHNSON. (L.S.)