IMPROVE- MENTS IN LAMPS
Year: 1873

page_text: LETTERS PATENT to George Burt, of Birmingham, in the County
of Warwick, Lamp Manufacturer, for the Invention of "IMPROVE-
MENTS IN LAMPS."
Sealed the 24th March 1874, and dated the 1st October 1873.
PROVISIONAL SPECIFICATION left by the said George Burt at the
Office of the Commissioners of Patents, with his Petition, on the
1st October 1873.
I, GEORGE BURT, of Birmingham, in the County of Warwick, Lamp
Manufacturer, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN LAMPS," to be as follows, that is to say :-
The improvements have reference to the means by which the supply
of air to lamps of any description is regulated, but the improvements
are more particularly applicable to mineral oil lamps.
I form a covered air chamber or box of any desired outline around the
lower portion of the burner of the lamp, perforated upon the upper

page_text: surface with any desired number of holes. The burner is formed so as
to cover the holes which are nearest the centre of the lamp, and above
each of these enclosed holes is a tube passing through the body of the
burner and thus out at perforations on its upper surface around the
aperture for the flame. The glasses being placed in the usual positions
the air is supplied through the perforations into the air chamber,
and from thence up through the tubes to the flame of the lamp, thus
fooding the flomo
surface with any desired number of holes. The burner is formed so as
to cover the holes which are nearest the centre of the lamp, and above
each of these enclosed holes is a tube passing through the body of the
burner and thus out at perforations on its upper surface around the
aperture for the flame. The glasses being placed in the usual positions
the air is supplied through the perforations into the air chamber,
and from thence up through the tubes to the flame of the lamp, thus
feeding the flame.
The supply of air to the flame is regulated by proportioning the
opening at the top of the outer glass, and also the size of the inner glass
to the size of the burner of the lamp.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said George Burt in the Great Seal Patent Office on
the 1st April 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE 1
BURT, of Birmingham, in the County of Warwick, Lamp Manufacturer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the First day of October, in the
year of our Lord One thousand eight hundred and seventy-three, in thos
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said George Burt, Her special
licence that I, the said George Burt, my executors, administrators,
and assigns, or such others as I, the said George Burt, my 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
LAMPS," upon the condition (amongst others), that I, the said George
Burt, my executors or administrators, by an instrument in writing
under my, or their, or one of their hands and seals, should par-
ticularly describe and ascertain the nature of the said Invention,
and in what manner the same was to be performed, and cause

page_text: 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 I, the said George Burt, do hereby declare
the nature of my said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement, that is to say :-
My improvements have reference to the means by which the supply
of air to lamps of any description is regulated, such improvements being
more particularly applicable to mineral oil lamps.
The nature of my Invention will be more readily understood by
referring to the Drawings hereunto annexed and to the letters and
figures marked thereupon.
Fig. 1 is a plan, Fig. 2 an elevation, and Fig. 3 a section of a lamp
constructed according to my Invention, and adapted for burning any
suitable kind of mineral oil; the improvements being also applicable to
other descriptions of lamps.
I form a covered air chamber or box (a) of any desired outline around
the lower portion of the burner (6) of the lamp, perforated upon the
upper surface with any desired number of holes (c). The burner (6) is
formed so as to cover the holes which are nearest the centre of the
lamp, and above each of these enclosed holes is a tube (d) passing
through the body of the burner (6) and through the cone at (e) around
the aperture (f) for the flame. The glasses (9) and (h) being placed
in the usual positions the air is supplied downwards between the
glasses (g) and (h), through the perforations (c), into the air
chamber (a), and from thence up through the tubes (d) to the flame
of the lamp, thus feeding the flame.
The supply of air to the flame is regulated by proportioning the
opening at the top of the outer glass (9) and also the size of the inner
glass (h) to the size of the burner of the lamp. And as shewn in the
elevation, Fig. 2, I form the outer glass (9) somewhat longer than the
inner glass (h).
Having thus described the object and nature of my said Invention and
the manner in which the same is to be carried into effect, I claim, with-
out limiting myself to these precise details, the improvements in

page_text: lamps for regulating the supply of air thereto, substantially in manner
as herein more fully set forth and specified.
In witness whereof, I, the said George Burt, have hereunto set
my hand and seal, this Thirty-first day of March, in the year
of our Lord One thousand eight hundred and seventy-four.