Improvements in Bunsen Gas Burners.
Year: 1897

page_text: Improvements in Bunsen Gas Burners.
I, HUGH MARSHALL, of 131, Warrender Park Road, Edinburgh in the County.
of Mid Lothian, North Britain, Assistant in Chemistry at the University of
Edinburgh, do hereby declare the nature of this Invention to be as follows, that
is to say:-
The
My said Invention has for its object to improve the construction and action of
Bunsen burners, and to prevent the obstruction of the gas inlet or inlets by
matters falling into the tube in which the gas and air become mixed.
Invention is applicable to various kinds of Bunsen burners including such as are
used in chemical laboratories and such as form part of incandescent gas burners.
In a burner constructed according to my Invention the air or mixing tube is
open completely through, whilst the gas instead of entering through a nozzle in
the centre of the lower part of the tube, is admitted through a small passage formed
in the side of the tube so that its upper end opens into the tube in a direction
inclined from the vertical towards the interior of the tube. With this construc-
tion the gas and air become well mixed, and if the inlet for the air at the bottom
of the tube is of a suitable moderate size or is adjusted by means of a valve no
further adjustment is required at that inlet to diminish the air supply when the
supply of gas is reduced to even a very small amount.
There may be two or more of the gas inlets; or the gas may enter the tube
through a number of small upwardly inclined orifices round the tube, or through
a slit extending round the tube. For the slit arrangement the bottom of the
tube may be enlarged and have screwed into it a ring or gland shaped to form an
annular space to receive the gas, and with a conical part nearly fitting a hollow
conical surface formed in the tube, the space between the two allowing the gas to
pass into the tube in a thin film.
Dated this Fourth day of January 1897.
EDMUND HUNT,
Applicant's Agent.
I, HUGH MARSHALL of 131 Warrender Park Road, Edinburgh, in the County
of Mid Lothian, North Britain, Assistant in Chemistry at the University of
Edinburgh do hereby declare the nature of this invention and in what manner
Price 8d.]

page_text: the same is to be performed, to. be particularly described and ascertained in and
by the following statement, that is to say:
My said Invention has for its object to improve the construction and action of
Bunsen burners, and to prevent the obstruction of the gas inlet or inlets by matters
falling into the tube in which the gas and air become mixed. The Invention is
applicable to various kinds of Bunsen burners including such as are used in chemical
laboratories and such as form parts of incandescent gas burners.
In a burner constructed according to my Invention the air or mixing tube is
open completely through, whilst the gas instead of entering through a nozzle in
the centre of the lower part of the tube, is admitted through a small passage or
passages formed in the side of the tube. The open bottom or air inlet of the tube
may for some purposes be more or less closed by an adjustable valve.
And in order that my said Invention and the manner of performing the same
may be properly understood I hereunto append a sheet of explanatory drawings,
to be hereinafter referred to, and showing two modifications of a bunsen burner
as made according to my Invention.
Figure, 1, is a sectional elevation of one modification of the improved burner,
Figure, 2, being an inverted plan of the same. Figure, 3, is a sectional elevation
of a second modification of the improved burner. In these drawings the same
reference letters are used to mark the same or like parts wherever they are
repeated.
In carrying out my Invention according to the modification shown in Figures, 1,
and 2, the air or mixing tube, A, is open completely through whilst the gas
instead of entering through a nozzle in the centre of the lower part
of the tube, is admitted through a small passage, B, formed in the
side of the tube SO that its upper end opens into the tube in an
upward direction inclined from the vertical towards the interior of the
tube. The tube, A, is screwed or otherwise fixed into a suitable base, C, made
with an opening, 1), to correspond with the open bottom of the tube. The base, C,
is made with feet, E, to raise it so as to allow air to enter the opening, D, which
may have applied to it an adjustable valve, G, forming part of a lever centered
on a pin, H, and movable by one end which projects through a slot in one of the
feet of the base. With the improved construction the gas and air become well
mixed, and if the inlet, D, for the air at the bottom of the tube, A, is of a suitable
moderate size or is adjustable (as in this modification) by means of a valve, no
further adjustment is required at that inlet to diminish the air supply when the
supply of gas is reduced to even a very small amount..
part, J,
There may be two or more of the gas inlets (B); or the gas may enter the
tube (A.) through a number of small upwardly inclined orifices round
the tube or through a slit entering round the tube. For the slit
arrangement (which is shown in Figure, 3) the bottom, of the tube, A,
may be enlarged but preferably the base, C, is formed with. a
larger in diameter than the tube and into this part the tube is screwed.
A ring
or gland, K, is screwed into the opening, (D) in the base, C, and is shaped to form
an annular space, L, to receive the gas, and with a conical part, M, nearly fitting
an internal conical surface, N, formed in the tube, the space between the two
allowing the gas to pass into the tube in a thin film. A valve, G, similar to the
valve of the modification first described is shown as provided in this modification
and in both modifications a branch pipe, P, to which a rubber or other tube may
be fixed for conveying the gas to the burner, is screwed into a boss or nipple Q,
on the base, C.
The improved burner is made with an open top, but in cases in which it is
desirable a cap, R, such as is indicated by dotted lines in Figures, 1, and 3, or of
any other suitable form may be screwed upon it.
With the improved burner there is no central gas jet to become choked by
matters falling down the tube and the flame can be turned down very low without
firing back even when the air supply is not specially regulated.

page_text: 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
In a Bunsen gas burner making the air or mixing tube open completely through,
and forming a passage or passages in its side for admitting the gas substantially
as hereinbefore described.
T31
..
1005