Improvements in and relating to Incandescence Burners and Mantle Supports.
Year: 1898

page_text: Date of Application, 23rd Dec., 1898
Complete Specification Left. 21st Oct.. 1899-Accented. 25th Nov.. 1809
Date of Application, 23rd Dec., 1898
Complete Specification Left. 21st Oct.. 1899-Accented. 25th Nov.. 1809
PROVISIONAL SPECIFICATION,
Improvements in and relating to Incandescence Burners and Mantle
Supports.
I, JOHN HENRY HILL DUNCAN, of 39, Coleman Street, in the City of London,
Chartered Accountant, do hereby declare the nature of this invention to be as
follows
-
This invention has reference inter alia to improved constructions of Bunsen
burners of the kind in which an intimate mixture of air and combustible gas or
vapour 18 supplied through a burner tube the tenor of which is on may be of
gradually decreasing cross sectional area from its lower end, where the air and
gas or vapour enter it, up to a certain point from which the interior of the tube
is of gradually increasing cross sectional area towards the top.
According to this invention the upper end or head of such a burner tube, which
may be of cylindrical, conical o Hang shape, 18 made plain, that is to say,
without lateral perforations and without any centially aanged guiding surface,
and 18
closed at the top by a plate that is formed near its outer
periphery with a Belleg of holes through which the intimate mixture
of air and gas or vapour flowing upward through the burner tube can directly
pass without abrupt change of direction and, being ignited on the outside of
the head of the tube, impinge upon the incandescent mantle supported above the
head.
In one construction, the burner tube comprises a lower truncated conical or
approximately comical portion provided at the bottom with lateral air inlet holes
and a centrally arranged gas inlet nozzle; a plain intermediate inverted conical
or approximately conical portion; and a plain cylindrical upper portion, the
three portions being arranged co-axially one above the other and integral with
one another.
The upper cylindrical portion of the tube 18 or may be of the same diameter as
the upper end of the intermediate portion and is closed by a flat top plate formed
with an annular row of circular holes arranged near together each hole having
extending from it towards the centre of the plate a narrow slit having a length
say about equal to twice the diameter of the hole In a modified construction the
top plate is formed with an annular row of holes that are broader at their outer
sides than at their inner sides, e, pear shaped in plan.
Each hole and slit may be made of upwardly tapering shape in section.
The top plate in each case is suitably adapted to carry a central mantle holder
or support
Burner heads constructed as described may be used with burner tubes other
than those of the kind hereinreferred to, for example with tubes having parallel
or nearly parallel bores.
In order to facilitate the mounting of incandescence mantles upon burners by
unskilled persons and to retain the mantle in proper position for use, the perforated
top plate of the burner is adapted, as for example by making it in the form of a

page_text: cap, to be readily put on and removed from the top of the burner tube and to the
cential portion of such plate is suitably fixed the lower end of the mantle support
to the upper end of which the upper end of the mantle is permanently fixed, the
lower end of the mantle fitting around the cap-like top plate, the arrangement
being such that the top plate, mantle support and mantle form practically one
article that can be readily handled without liability of breaking the mantle. The
lower end of the mantle support may conveniently be fixed by suitable material
such as plaster of Paris or cement in a centrally recessed portion of the top plate,
and the top part or closs piece of the mantle may be also fixed to the upper end
of the mantle support by plaster of Pauis or the like Such combined top plate,
mantle support and mantle may be used with incandescence burners of various
kinds.
Improvements in and relating to Incandescence Burners and Mantle
Supports.
I, JOIN HENRY HILL DUNCAN, of 39, Coleman Street, in the City of London,
Chartered Accountaut, do 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
1
This invention has reference inter alu to improved constructions of Bunsen
burners of the kind in which an intimate mixture of an and combustible gas or
vapour is supplied through a burner tube the interior of which 18 or may be of
gradually decreasing cross sectional area from its lower end, where the air and
gas or vapou enter it, up to a certain point from which the interior of the tube
a of gradually increasing cross sectional area towards the top, and such for
instance as are described in the Specification of F de Mare No 10497 of 1894.
According to this invention the upper end or head of such a burner tube, which
may be of cylindrical, conical or Haring shape, is made plain, that is to say,
without lateral perforations and without any centrally arranged guiding surface,
and is provided at the top with a plate that is formed near its outer periphery. with
a series of holes through which the intimate mixture of air and gas or vapour
flowing upward through the burner tube can directly pass without abrupt
change of direction, and, being ignited on the outside of the head of the tube,
will produce flame that will impinge upon an incandescence mantle supported
above the head
Fig 1 shows in vertical section and Fig 2 in plan, a Bunsen buiner according
to this invention suitable for incandescence gas lighting The buiner tube in this
example comprises a lower truncated comical or approximately conical portion 1
provided at the bottom with lateral air inlet holes 2 and a centrally arranged gas
inlet nozzle, a plain intermediate inverted conical or approximately conical
portion 4, and a plain cylindrical upper portion 5, the three portions being
arianged co-axially one above the other, and it may be, as shown, integral with
one another The upper cylindrical portion 5 of the tube mar, as shown, be of
approximately the same diameter as the upper end of the intermediate portion 4

page_text: and is partially closed by a top plate 6 formed with an annular row of circular
holes 7 arranged near together, each hole having extending from it towards the
centre of the plate, a narrow slit 7 of a length sar about equal to twice the
diameter of the hole The perforated top plate 6 may conveniently be formed
in one piece with a short sheet metal tube 0° so as to constitute a cap that can'
be readily slipped on and off the upper portion 5 of the tube, the said cap being
supported in place by a bead 5 formed at the junction of the parts 4 and 5 of
the buiner tube Fig 3 is a similar view to Fig 2 showing a modified construction
in which the holes 7-7" in the top plate 6 are made broader at their outer
ends 7 than at their inner ends 7, ze pear shaped in plan
As will be seen a burner according to this invention has no internal perforated
shell or like baffling or guiding device such as 18 shown in Fig 2 of De Mare's
Baid specification, or such as 18 now used in buineis of this class
In this way
there can be obtained in a simple manner, a flame having a high heating power and
specially suitable for incandescence gas lighting without the aid of a chimney.
Each hole and slit 77" may be made of upwardly tapering shape in section,
as for example, by punching the top plate from the under side
The top plate or cap 6 in each case 18, as usual, suitably adapted to carry a
central mantle holder or support For this purpose it may, as shown, be
provided with a vertical socket 8
Burner heads constructed with a top plate having apertures 7-7 of the kind
described can advantageously be used with burner tubes other than those of the
kind herein referred to for example with Bunsen tubes having parallel or nearly
parallel bores
In order to facilitate the mounting of incandescence mantles upon burners
by unskilled persons, and to retain the mantle in proper position for use, the
puforated top plate 6 of the burner is adapted, by making it in the form of a cap,
as shown in vertical section in Figs 1 and 4, to be readily put on and removed
from the top part 5 of the buiner tube To the central portion of such plate
18 suitably fixed the lower end of the mantle support 9, to the upper end of which
the upper end of the mantle 10 is securely fixed, the lower end of the mantle
fitting around the cap By this means the cap, mantle support and mantle form
practically one article that can be readily packed and transmitted by post or -
otherwise from one place to another and can be readily handled with much less
lability of breaking the mantle or of setting it in an inefficient position on the
Lurner tube than has heretofore been usual The lower end of the mantle
support 9 may conveniently be fixed by suitable material 11 such as plaster of
Paris, steatite, cement or the like in the centrally recessed part or socket 8
carried by the top plate 6, and the top part or cross piece of the mantle may
be also fixed to the upper end of the mantle support 9 by plaster of Paris, steatite,
cement or like material, as shown at 12. Instead of making the cap fit on the
outside of the burner tube as in Fig 4, it may obviously be made to fit within
the top of the burner tube as shown in Fig 5 In this case the cap should be
somewhat longer to make suitable provision for handling it without damaging
the mantle The making of the top plate carrying the burner perforations in the
form of a removable cap presents several advantages and this part of my inven-
tion can be used with incandescence burners of various kinds
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed I declare that what
I claim is.-
-
1. An incandescence gas burner having the top plate formed with an annular
row of approximately encular holes furnished with narrow slits substantially as
shown in Figs 2 and 3 of the drawings annexed.
2 The improved incandescence gas burner constructed substantially as herein-
before described with reference to Figs. 1, 2 and 3 of the drawings annexed.
3. In an incandescence gas burner, making the plate carrying the perforations

page_text: through which the gas issues in the form of a removable cap fitting the top of the
buiner tube, substantially as described.
4. For incandescence gas burners a removable attachment consisting of a cap,
a mantle support and a mantle, united together so that the said attachment may
be removable and portable as a whole, substantially as described
Dated this 20th day of October 1899.
For the Applicant,
W LLOYD WISE,
46, Lincoln's Inn Fields, London, WC,
Chartered Patent Agent.