An Improvement in Bunsen Gas Burners.
Year: 1897

page_text: Date of Application, 30th Dec., 1897
Complete Specification Left, 13th June, 1898-Accepted, 23rd July, 1898
France, Engineer.]
An Improvement in Bunsen Gas Burners.
I, JULIUS MOELLER, of No. 14, Palmer Street, Westminster, in the County of
London, Manager, do hereby declare the nature of this invention to be as
follows:-
―:
This invention relates to Bunsen gas burners employed for obtaining a non
luminous flame of great heating power especially adapted for producing light by
the incandescence of a refractory mantle. Such burners have been made with
a tube in which air and gas are mixed and ascend, this tube having near its
middle or a little below it a narrow neck from which the tube tapers both ways to
a larger diameter, the taper of the upper part being part of a cone the sides of
which are inclined to each other at an angle not exceeding 10°.
It has been found that the efficiency of a tube of this kind is greatly enhanced
by making its taper not uniform but following the outline of a hyperbola, so that
the interior of the tube is in the form of a hyperbolic spindle or solid of revolu-
tion formed by the revolution of a hyperbola round the axis of the tube.
The particular form of the hyperbola and the construction of the tubes are
illustrated by the accompanying drawings, Fig. 1 being a diagram shewing the
form of the hyperbola and Fig. 2 being a vertical section of the tube.
Referring first to Fig. 1, CD is the axis of the tube and the centre of the
neck or narrowest part, where the radius AO, of any desired dimension, deter-
mines A the vertex of the hyperbola. Through are drawn two straight
lines MM and N N each inclined to the axis CD at an angle of about 8°.
The hyperbola A¹A A" is drawn such that these inclined lines are its
asymptotes.
As shewn in Fig. 2, the part of the tube below the neck is somewhat shorter than
the part above the neck, as it is found that the air which is admitted at the
holes H and the gas entering by the jet orifice G form an explosive mixture
while ascending to the neck through the lower part of the tube of less length
than the upper part.
1007
ABEL & IMRAY,
Agents for the Applicant.

page_text: An Improvement in Bunsen Gas Burners.
I, JULIUS MOELLER, of No. 14, Palmer Street, Westminster, in the County of
London, Manager, do hereby declare the nature of this invention (as communicated
to me from abroad by Ottmar Kern, formerly of 9, Avenue de l'Opera, Paris,
France, but now of 16, Quai de Louvie, Paris, France, Engineer,) and in what
manner the same is to be performed to be particularly described and ascertained in
and by the following statement: -
This invention relates to Bunsen gas burners employed for obtaining a non
luminous flame of great heating power especially adapted for producing light by
the incandescence of a refractory mantle. Such burners have been made with
a tube in which air and gas are mixed and ascend, this tube having near its
middle or a little below it a narrow neck from which the tube tapers both ways to
a larger diameter, the taper of the upper part being part of a cone the sides of
which are inclined to each other at an angle not exceeding 10°.
It has been found that the efficiency of a tube of this kind is greatly enhanced
by making its taper not uniform but following the outline of a hyperbola, so that
the interior of the tube is in the form of a hyperbolic spindle or solid of revolu-
tion formed by the revolution of a hyperbola round the axis of a tube.
The particular form of the hyperbola and the construction of the tubes are
illustrated by the accompanying drawings Fig. 1 being a diagram shewing the
form of the hyperbola and Fig. 2 being a vertical section of the tube, Fig. 3 is a
section of the burner placed upon the tube and Fig. 4 is a plan of the top of the
burner.
Referring first to Fig. 1, CD is the axis of the tube and () the centre of the
neck or narrowest part, where the radius AO of any desired dimension, deter-
mines A the vertex of the hyperbola. Through are drawn two straight
lines M M and N N each inclined to the axis CD at an angle of about 8°.
The hyperbola A¹ A A¹ is drawn such that these inclined lines are its
asymptotes.
The part of the tube 7 below the neck may be varied in length, a suitable length
is three or four times the diameter of the neck, with such proportion it is found
that the air which is admitted at the holes 3 and the gas entering by the jet
orifice 2 form an explosive mixture while ascending to the neck through the lower
part of the tube.
The burner which surmounts the tube 7 as shewn in Figs. 3 and 4 comprises an
outer case 15 somewhat tapering the inner screen 13 of perforated metal having at
its top a button 36 of good conducting metal on which is fixed a disc 37 a little
smaller in diameter than the mouth of the case 15 and having its edge serrated
so that it presents the appearance of a toothed wheel.
The mixture of gas and air as is indicated by the arrows after ascending the
tube 7 passes through the perforations of the screen 13 then through the annular
opening surrounding the disc 37 and also through the intervals between its teeth
and being kindled produces an intensely heating non luminous flame which heats
to incandescence the refractory mantle 23.
The taper of the case 15 and the screen 13 may be varied they may even be
made cylindrical without any taper. Also the button 36 may be of less depth than
is shewn in the drawing but it is preferred to have a considerable mass of metal
to conduct heat from the disc 37 to the screen 13 thus preventing the disc from
being overheated, and giving heat to the combustible mixture on its way to the
tip of the burner.

page_text: Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, I declare that what
I claim is:
1. An incandescence gas burner tube made in the form of a hyperbolic spindle
substantially as described.
2. The combination of a tube such as is above referred to with a burner com-
prising an outer casing an inner perforated screen, a button thereon and a disc
having a serrated edge, arranged and operating substantially as described.
1941 dow of Tune 1898
ABEL & IMRAY,
Agents for the Applicant.