IMPROVEMENTS IN APPARATUS TO BE APPLIED TO LAMPS AND BURNERS FOR THE MORE PERFECT COMBUSTION OF CARBURETTED GASES
Year: 1867

page_text: LETTERS PATENT to Herbert Allman, of Ampthill Square, in the County
of Middlesex, Civil Engineer, and Frederic Newton Gisborne, of
445, West Strand, in the said County, Civil Engineer and Electrician,
for the Invention of "IMPROVEMENTS IN APPARATUS TO BE APPLIED TO
LAMPS AND BURNERS FOR THE MORE PERFECT COMBUSTION OF CARBURETTED
GASES."
Sealed the 11th February 1868, and dated the 5th November 1867.
PROVISIONAL SPECIFICATION left by the said Herbert Allman and
Frederic Newton Gisborne at the Office of the Commissioners of
Patents, with their Petition, on the 5th November 1867.
We, HERBERT ALLMAN, of Ampthill Square, in the County of Middlesex,
Civil Engineer, and FREDERICK NEWTON GISBORNE, of 445, West Strand, in
the said County, Civil Engineer and Electrician, do hereby declare the nature
of the said Invention for "IMPROVEMENTS IN APPARATUS TO BE APPLIED TO.
LAMPS AND BURNERS FOR THE MORE PERFECT COMBUSTION OF CARBURETTED GASES,"
to be as follows:-
Our Invention consists in the regulation of the admission of the atmospheric
air to the flame produced by the ignition of coal or other carburetted gases in
lamps by the movement of a valve placed so as to open or shut the air passage..
This movement we produce by means of a bar joined on to the valve composed

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Herbert Allman and Frederic Newton Gisborne in the
Great Seal Patent Office on the 4th March 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, HERBERT
ALLMAN, of Ampthill Square, in the County of Middlesex, Civil Engineer,
and FREDERICK NEWTON GISBORNE, of 445, West Strand, in the said County,
Civil Engineer and Electrician, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fifth day of November, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirty-first year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us, the
said Herbert Allman and Frederic Newton Gisborne, Her special licence
that we, the said Herbert Allman and Frederic Newton Gisborne, our executors,
administrators, and assigns, or such others as we, the said Herbert Allman
and Frederic Newton Gisborne, our executors, administrators, and 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 TO BE APPLIED TO LAMPS AND BURNERS FOR
THE MORE PERFECT COMBUSTION OF CARBURETTED GASES," upon the condition
(amongst others) that we, the said Herbert Allman and Frederic Newton
Gisborne, our executors or administrators, by an instrument in writing
under our, or their, or one of their hands and seals, 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 Letters Patent..
NOW KNOW YE, that we, the said Herbert Allman and Frederic
Newton Gisborne, do hereby declare the nature of our 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 bad to
the Drawings hereunto annexed, and to the letters and figures marked the re in
that is to say:-

page_text: Our Invention consists in improved apparatus which we apply to the
chimney or shade of a lamp for the purpose of regulating by the action of a
valve the admission and distribution of the atmospheric air supplied to the
flame of the ignited gas; the gas burned in the lamp may be coal or other
carburetted gas, or a gas generated by the combustion of oil, paraffine, or other
liquids ordinarily used for lighting purposes. We have found that the object
is best effected by employing a valve that is made moveable in the manner
shewn in the annexed Drawing. Similar letters refer to the same parts in all
the Figures.
Fig. 1 is a transverse section of the valve;
Fig. 3 is a perspective view of valve; Fig. 4 is a
and valve.
Fig. 2 is a plan of same;
side view of glass chimney
:
A, A, is a ring of metal, either brass, iron, or any other suitable metal capable
of resisting the action of heat and flame; B is a hinge or joint on which point.
the valve C turns and lifts, which hinge is fixed to the ring A, A; D is a bar.
of compound metal fixed in any convenient manner to the ring A, A. The
said bar D we prefer making of steel and brass, in sheet or other suitable form,
being either riveted or soldered together; this bar D being fixed to the ring
A, A, as described. The brass being under or next the flame where it receives:
heat from the flame, the brass expanding. more than the steel causes the said
bar D to curve or bend upwards, thereby lifting the valve plate C. In order to
give steadiness to the flame we employ a button such as is shewn at F in the
Drawing. When our apparatus is placed on the top of the chimney of a gas
burner or lamp glass the opening or closing of the valve plate C by the action
of the bar D regulates the quantities of air passing through the glass or
chimney. We prefer to use with our apparatus a chimney of the form shewn
in Figure IV.; thus when the flame is not ignited the valve is nearly closed,
but on ignition of the flame the bar D under the influence of the increasing
temperature begins to open the valve as described by the bending upwards of
the bar D at the point C. As the flame increases and the temperature is
augmented the valve opens and gives passage to a larger quantity of atmos-
pheric air or oxygen, thus producing the more perfect combustion of carburetted
gases.
We wish it to be understood that while we prefer to use steel and brass
as we have described, we do not restrict ourselves to the use of any particular
combination of metals for the compound bar C, as any two suitable metals
which are not fusible at the heat they would be subject to may be used for
the above purposes.
It is necessary that one of the two metals should be
capable of greater expansion than the other under the influence of an equal

page_text: increment of heat, so that the said bar may be caused to alter in form to
produce the required effect.
It is obvious that the object of our Invention may be partially attained by
fixing the valve open to such an extent that with a flame of the average
volume, giving out the average amount of heat, the requisite amount of air
and oxygen may be allowed to pass; but in such a case the valve would not
be self-adjusting. Or instead of employing a hinged valve, such as we find
most beneficial, a disc of metal connected with a supporting ring or frame by
supporting pieces might be used, apertures being left of such a size as to suit
à flame of the average volume emitted by the burner.
We prefer to make the parts of our apparatus of metal, but for some of
the parts other substances which will resist the action of heat, such as earthen-
ware or mica, may be used with advantage.
Having now described our Invention, we would have it understood that we
do not confine ourselves to the exact form and arrangement of parts as shewn
by us, as they may be varied without departing from our Invention, but what
we claim is, our improved apparatus for regulating the supply of air to the
flame of a lamp, such apparatus being constructed and arranged substantially
as herein-described.
In witness whereof, we, the said Herbert Allman and Frederic Newton
Gisborne, have hereunto set our hands and seals, this Second day
of March, in the year of our Lord One thousand eight hundred
and sixty-eight.
HERBERT ALLMAN.
(L.S.)
FREDERIC NEWTON GISBORNE. (L.S.)
Signed, sealed, and delivered by the
above-named Herbert Allman and
Frederic Newton Gisborne, in the
presence of