A CERTAIN IMPROVEMENT OR CERTAIN IMPROVEMENTS IN EFFECTING THE COMBUSTION OF GAS, OIL, CAMPHINE, AND OTHER SUBSTANCES WHICH ARE OR MAY BE BURNED FOR THE PRODUCTION OF LIGHT
Year: 1847

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
HUNT, of Birmingham, in the County of Warwick, Brass Founder, send
greeting.
WHEREAS Her present most Excellent Majesty Queen Victoria, by Her
Royal Letters Patent under the Great Seal of the United Kingdom of Great
Britain and Ireland, bearing date at Westminster, the Third day of July,
One thousand eight hundred and forty-seven, in the eleventh year of Her reign,
did, for Herself, Her heirs and successors, give and grant unto me, the said
John Hunt, my exors, admors, and assigns, Her especial licence, full power,
sole privilege and authority, that I, the said John Hunt, my exors, admors,
and assigns, and such others as I, the said John Hunt, 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 law-
fully might make, use, exercise, and vend, within England, Wales, and the
Town of Berwick-upon-Tweed, my Invention of "A CERTAIN IMPROVEMENT
OR CERTAIN IMPROVEMENTS IN EFFECTING THE COMBUSTION OF GAS, OIL, CAMPHINE,
AND OTHER SUBSTANCES WHICH ARE OR MAY BE BURNED FOR THE PRODUCTION OF
LIGHT;" in which said Letters Patent is contained a proviso that I, the said
John Hunt, should cause a particular description of the nature of my said
Invention, and in what manner the same is to be performed, by an instru-
ment in writing under my hand and seal, to be inrolled in Her Majesty's
High Court of Chancery within six calendar months next and immediately

page_text: 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
John Hunt, do hereby declare that the nature of my said Invention, and the
manner in which the same is to be performed, are fully described and ascer-
tained in and by the following statement thereof, reference being had unto the
Drawing hereunto annexed, and to the letters and figures marked thereon,
that is to say:-
The first part of my Invention consists in the application of caps, discs, or
plates of perforated metal or wire gauze, or perforated caps, discs, or plates of
any other substance which is not injuriously affected by heat to the tops of
the chimnies or glasses of gas, oil, camphine, or other lamps. In carrying
this part of my Invention into effect I do not limit myself to any particular
method of attaching the said caps, discs, or plates to the said lamp glasses
or chimnies, as the same may be varied without departing from the nature
of my said Invention.
Figs. 1, 2, 3, and 4 represent several forms of these caps, discs, or plates
placed on the tops of lamp glasses or chimnies. I am aware that plates or
discs of metal have been attached to lamp glasses or chimnies by being fixed
at a distance above the tops of the said glasses or chimnies, and also that
plates of metal have been suspended in the interior of lamp glasses or chimnies;
but my Invention consists in the use of perforated caps, discs, or plates of any
suitable substance (or of any suitable fabric, such as wire gauze), the said
caps, discs, or plates fitting on the tops of lamp glasses or chimnies. The
application of the said caps, discs, or plates to gas, oil, spirit, or other lamps
causes an enlargement of the flames of the said lamps, and thereby produces
an increased amount of light by the consumption of the same amount of
the combustible substance.
The second part of my Invention consists of an improved method of con-
structing Argand gas burners, and the chimney holders attached thereto.
Figs. 5 and 6 illustrate this part of my Invention. In the ordinary method
of constructing argand burners and chimney holders the said burners and
holders are made in several pieces joined by soldering or otherwise. Thus in
constructing the burner and holder, Fig. 5, in the ordinary manner, it is usual
to join the parts of the same at the places marked a, a, a. According to my
improved method of constructing the same, I cast in one piece, either the
outer cylinder 6 of the burner, and the bottom c and rim d of the glass holder,
as represented in Fig. 5, or I cast the inner cylinder e of the burner and the
bottom and rim g of the glass holder in one piece, as represented in Figure 6.

page_text: Or instead of casting I produce the same by stamping from sheet metal. The
methods of casting and stamping by which I produce my improved burners
and glass holders do not differ from the methods well known and commonly
practised, and I therefore deem it unnecessary to give a particular description
of the same. The completion of the said burners by the addition of the inner
cylinder, when constructed according to the method represented in Fig. 5,
or by the addition of the outer cylinder, when constructed according to the
method represented in Fig. 6, is effected by methods commonly practised, and
constitutes no part of my Invention.
Having now described the nature of my said Invention, and the manner in
which the same is to be performed, I wish it to be understood that I claim as
my Invention,
Firstly, the construction of the inner or outer cylinders of Argand burners,
together with the bottoms and rims of the glass holders of the said burners in
one piece, whether the same be made by casting or stamping.
Secondly, the application of caps, discs, or plates of perforated metal or wire
gauze, or perforated caps, discs, or plates of any other substance which is not
injuriously acted upon by heat, to the tops of the chimnies or glasses of oil, gas,
and other lamps.
In witness whereof, I, the said John Hunt, have hereunto set my hand
and seal, this Thirty-first day of December, One thousand eight hundred