Improvements in Incandescent Gas Burners.
Year: 1899

page_text: Date of Application, 4th Apr., 1899-Accepted, 10th June, 1899
Improvements in Incandescent Gas Burners.
OTTO CONRAD, of Arndt-Str. 41, in the City of Berlin, in the German Empire,
Work-master, 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:-
It is well known that the present systems of incandescent gas burners have a
serious drawback, inasmuch as the gas mixture distributes itself throughout the
whole of the interior of the mantle, and escapes to a large extent through the
meshes of the upper part of the latter, without having acted upon the lower part,
which, nevertheless, is the portion which chiefly radiates the light.
The purpose of the present invention is to conduct the gaseous mixture to
the mantle in such manner that it may only escape at the periphery of the
burner, and therefore stream along the inside wall of the mantle, whilst the
interior of the burner zone is protected against the entry of gas.
On the drawing,
Fig. 1 shows a side elevation of the burner, with the right hand half in section,
taken on the line X-Y Fig. 1-2.
Fig. 2 is a plan view of half of Fig. 1.
Fig. 3 is a plan view of the sieve and parts below it.
Fig. 4 is a plan view of the gas nozzle.
a is the suspension for the incandescent mantle and a the anchor or holder,
bis the mantle, c the cylinder, the gallery, e is the screw thread of the part
into which is inserted the sieve f, serving to filter the gas which enters through
the opening g mixed with air, and ascend to the burner.
On this sieve f is set a bell shaped cover h, which is closed at the top by a
cap or plate i. This bell is provided with perforations k, over nearly the
hole of its surface. It is surrounded by a shield, which has above a slightly
greater diameter than the plate i, so that a narrow annular space is left between
the two parts.
The manner in which the device operates is as follows:
The gas rushes through the nozzle m sucks in air through the apertures n
and becomes thoroughly mixed with the latter in the long mixing pipe o of
peculiar form. The gaseous mixture is then filtered by passing through the
sieve f and ascends into the bell h, then again issuing from it through the per-
forations kon all sides. The mixture then rushes to the burner zone; and
this current of gas will not be a central one but, distributed in the form of a
ring. As the shield directly meets the mantle b, there can be no interruption
or deviation of the current of gas, such as hitherto has been the case, so that
the part of the mantle adjoining the shield 1 becomes immediately incan-
descent.
No gas can pass to the middle of the space surrounded by the mantle and
so stream to the top of the mantle and escape partly or wholly unburnt. On the
contrary, all the gas mixture which reaches the burner must stream along close

page_text: to the inside wall of the mantle b, that is, along the parts which are to be
rendered incandescent.
Having now particularly described and ascertained the nature of my said in-
vention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. An incandescent gas burner comprising a device applied below the sus-
pended incandescent mantle and directly meeting the same and presenting to it
a narrow annular passage through which the gas mixture can pass to the burner
all substantially as and for the purposes herein before set forth.
2. An incandescent gas burner comprising a perforated bell shaped cover or
shield h closed above by a plate i and surrounded by a second cover or shield
open above whereby a narrow annular space is formed between the tops of the
said shields h, 1, by which means the gas mixture is compelled to pass along the
inner wall of the incandescent mantle suspended above the said device, all
substantially as and for the purposes herein before set forth.
3. In an incandescent gas burner the arrangement of a pipe o contracted at
its central portion substantially as shown on the drawing.
Dated this 90th day of Movah 1800
WALTER FOLKMAR.
Agent for Applicant.