Year: 1886

page_text: I FREDERICK LESLIE of the Marylebone Metal Works 31 Great Titchfield Street
in the County of Middlesex Mem. Inst. C.E. do hereby declare the nature of this
invention to be as follows:-
My invention relates to an improvement on the gas burner patented by my late
father No. 10977 in the year 1845.
These burners consist of a series of fine tubes which rising up and inclining
inwards deliver the gas at their upper ends in a circle of fine orifices set so close
together that the jets coalesce and form a cylindrical flame. I have found that the
illuminating power of this flame is increased when the base of the flame within
the ring is to soine extent sheltered from the cooling effect of the upward current
of cold air so that the heat of the flame at this point may be more fully maintained.
I effect this by fixing within the circle of tubes and just below the orifices by
which the gas issues from them, a disc of a size to fill or occupy the whole of this
circular space except that there is a central aperture in the disc by which air can
ascend in the centre or axis of the cylindrical flame and also a narrow annular slit
close up to the edge of the disc by which a small quantity of air can pass to the
base of the flame to meet the gas as it issues from the tubes. The slit is complete
all around the disc except at a few points sufficient in number for the mechanical
connection of the ring on the outer side of the slit with the main or inner portion
of the disc.
Or I can replace the disc by a ring immediately within the circle of tubes and at
the level at which the gas issues from them. This ring is itself tubular and gas
in small quantity is supplied to it. The ring is finely perforated all around and
the perforations incline outwards.
The gas issuing from the perforations being ignited forms a small annular flame
which meets and mingles with the main flame immediately above the fine tubes
by which it is supplied. The inner flame both checks the air current and supplies
heat to the main flame.
The quantity of gas supplied to the inner annular flame should be much less
than that supplied through the fine tubes to feed the main flame.
With these burners it has heretofore been the practice to employ a glass chimney
with a shoulder formed in it and extending down to the lower ends of the fine
burner tubes such chimneys are expensive to make and very liable to breakage

page_text: when in use.
I employ a cylindrical chimney and I provide on the burner a metal
gallery to receive the chimney. The gallery is a deep metal ring surrounding the
burner tubes, it is cylindrical above and conical below. It has a flange projecting
inwards around its upper edge on the level of the orifices by which the gas issues.
This flange serves to properly limit the amount of air passing upwards around the
exterior of the flame and between the ring and the burner tube by which the flame
is fed.
The glass chimney is stepped into a ring groove at the top of the gallery
immediately outside the flange.
I improve fish tail and bats wing burners by adding a small jet set obliquely
so that the flame from this jet may meet the main flame at a short distance above
the orifice or orifices of the burner and in the part of the flame which usually is
non luminous.
The quantity of gas supplied to the small lateral jet is only a small fraction of
that which is supplied to the main burner.

page_text: I FREDERICK LESLIE, of the Marylebone Metal Works 31 Great Titchfield Street
in the County of Middlesex Mem. Inst. C.E. dc hereby declare the nature of this
invention and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement:-
My Invention relates to an improvement on the gas burner patented by my late
father No. 10977 in the year 1845.
These burners consist of a series of fine tubes which rising up and inclining
inwards deliver the gas at their upper ends in a circle of fine orifices set so close
together that the jets coalesce and form a cylindrical flame. I have found that the
illuminating power of this flame is increased when the base of the flame within the
ring is to some extent sheltered from the cooling effect of the upward current of
cold air so that the heat of the flame at this point may be more fully maintained.
I effect this by fixing within the circle of tubes and just below the orifices by
which the gas issues from them, a disc of a size to fill or occupy the whole of
this circular space except that there is a central aperture in the disc by which air
can ascend in the centre or axis of the cylindrical flame and also a narrow annular
slit close up to the edge of the disc by which a small quantity of air can pass to
the base of the flame to meet the gas as it issues from the tubes. The slit is
complete all around the disc except at a few points sufficient in number for the
mechanical connection of the ring on the outer side of the slit with the main or
inner portion of the disc.
With these burners it has heretofore been the practice to employ a glass chimney
with a shoulder formed in it and extending down to the lower ends of the fine
burner tubes such chimneys are expensive to make and very liable to breakage
when in use.
I employ a cylindrical chimney and I provide on the burner a metal
gallery to receive the chimney. The gallery is a deep metal ring surrounding the
burner tubes; it projects inwards, its upper edge is on the level of the orifices by
which the gas issues and it serves to properly limit the amount of air passing
upwards around the exterior of the flame and between the ring and the burner
tubes by which the flame is fed.
The glass chimney is stepped into a ring groove at the top of the gallery
immediately outside the flange.
I improve fish tail and bats wing burners by adding a small jet set obliquely so
that the flame from this jet may meet the main flame at a short distance above the
orifice or orifices of the burner and in the part of the flame which usually is non
luminous.
The quantity of gas supplied to the small lateral jet is only a small fraction of
that which is supplied to the main burner.
In order that my said invention may be fully understood and readily carried
into effect I will proceed to describe the drawings hereunto annexed,

page_text: DESCRIPTION OF THE DRAWINGS.
Figure 1 is a side elevation of my improved Leslie gas burner.
Figure 2 is a vertical section of the same.
Figure 3 is a plan with the chimney removed.
Figure 4 illustrates my improvement in fish tail and bats wing burners.
In Figures 1. 2 and 3 a. a. a. are the fine metal tubes of the Leslie burner, they
are here represented as taper tubes but this is not essential; they are set into an
annular pipe b and this at three equidistant points is connected with a socket c
adapted to screw on to a gas bracket. It is sometimes convenient that the
socket c should be on one side, when it is so the ring b should still to ensure
uniformity be supplied with gas at at least three points in the circumference. dis
the metal disc which I provide to shelter the interior of the flame to some extent
from the upward current of cold air. d¹ is the central aperture in the disc and d
the narrow annular slit which supplies a small quantity of air to the base of the
flame. d is a wire by which the disc is carried, it is fixed also to the pipe b. e is
the metal gallery which at e¹ on a level with the orifices of the tubes a projects so
as to prevent an excess of air passing upwards around the exterior of the flame;
by so doing it obviates the necessity for the use of a special glass chimney as has
heretofore been usual with Leslie burners. fis an ordinary cylindrical chimney;
its lower end fits into a groove in the gallery so as to prevent the entrance of air
except from beneath.
In Figure 4 g is an ordinary fish tail or bats wing burner nozzle and h represents
the flame formed by the gas issuing from it. i is a branch pipe terminating in a
very small burner nozzle j of the bats wing type. The dimensions of the two
nozzles are such that only about 5 or 6 per cent of the total amount of gas
'expended passes by the nozzle j. The purpose the auxilliary nozzle serves is to
supply only so much gas as is requisite to render luminous the non-luminous area
of the main flame.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed I declare that what
I claim is
1. The combination with a Leslie burner of a disc d regulating the interior air
current substantially as described.
2. The combination with a Leslie burner of a metal gallery e and cylindrical
chimney substantially as described.
3. The improved Leslie burner substantially as described and illustrated by the
annexed drawings.
4. The improved gas burner substantially as described and represented by
Figure 4 of the annexed drawings.
Dated this 18th day of November 1886.
ÇARPMAEL & CO.,
Agents for the Applicant.