An Improved Chimney for Incandescent Gas Lamp Burners.
Year: 1899

page_text: Date of Application, 29th Apr., 1899
Complete Specification Left, 27th Jan., 1900-Accepted, 3rd Mar., 1900
PROVISIONAL SPECIFICATION.
An Improved Chimney for Incandescent Gas Lamp Burners.
I, ROBERT HEINZEL, of No. 1, Schellinggasse Aussig, Vienna I, in the Empire
of Austria, Manager of the Aussig Glass Works, do hereby declare the nature
of this invention to be as follows:
This invention relates to an improved chimney for use with incandescent
lamps and by means of which the incandescent mantle of the burner is sur-
rounded by an evenly rising air current thereby increasing the heating power
of the flame and indirectly improving the illuminating power of the mantle.
The characteristic features of this improved chimney consist in bulging or
enlarging the chimney above the portion inserted into the gallery of the burner
bracket and the formation of apertures in the annular bottom portion of the
said bulge or enlarged part together with a second bulge or enlargement in the
chimney at the level of the knot of the mantle.
As above stated the chimney is bulged or enlarged above the socket or portion
serving for insertion into the gallery of the burner backet or bracket thus form-
ing an annular surface at right angles with the longitudinal axis of the chimney.
This annular surface is provided with several apertures by means of which
the mantle is provided externally with a cold air current passing up through
the chimney.
The number and form of these apertures may be varied in accordance with
the size of the burner.
The said apertures may be advantageously produced in the annular surface by
first making incisions and then bending the edges thereof downward so impart-
ing sufficient strength to the chimney notwithstanding its being weakened by
the apertures.
Another method of producing the apertures in the annular surface is to direct
an impinging flame onto the points where it is desired to form the aperture,
the glass is thereby caused to recede from the flame until finally an opening is
formed.
As already mentioned the improved chimney is formed with a second bulge
or enlargement level with the top of the crutch supporting the incandescent
mantle or in other words level with the knot in the mantle, for the purpose of
preventing to a certain extent the cracking of the chimney.
Dated this 29th day of April 1800
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.
for Incandescent Gas Lamp Burners.
I, ROBERT HEINZEL, of No. 1, Schellinggasse Aussig, Vienna I, in the Empire
f Austria, Manager of the Aussig Glass Works, do hereby declare the nature
[Price 8d.]

page_text: of this invention and in what manner the same is to be performed, to be parti-
cularly described and ascertained in and by the following statement;-
This invention relates to an improved chimney for use with incandescent
lamps and by means of which the incandescent mantle of the burner is sur-
rounded by an evenly rising air current thereby increasing the heating power
of the flame and indirectly improving the illuminating power of the mantle.
The characteristic features of this improved chimney consist in bulging or
enlarging the chimney above the portion inserted into the gallery of the burner
bracket and the formation of apertures in the annular bottom portion of the
said bulge or enlarged part together with a second bulge or enlargement in the
chimney at the level of the knot of the mantle.
The invention will be readily understood from the accompanying drawing in
which
Figure 1 shows an elevation of the improved chimney and
Figure 2 is a section on the line A B of Figure 1.
The drawing Figure 1 shows clearly how the chimney a is bulged or enlarged
above the socket or portion serving for insertion into the gallery of the burner
basket or bracket, thus forming an annular surface at right angles with the
longitudinal axis of the chimney.
This annular surface
is provided with several apertures c by which a cold
air current passes up through the chimney on the outside of the mantle.
The number and form of these apertures may be varied in accordance with
the size of the burner.
The said apertures may be advantageously produced in the annular surface b
by first making incisions and then bending the edges thereof downward so im-
parting sufficient strength to the chimney notwithstanding its being weakened
by the apertures.
Another method of producing the apertures in the annular surface is to
direct an impinging flame onto the points where it is desired to form the aper-
ture, the glass is thereby caused to recede from the flame until finally an opening
is formed.
As already mentioned the improved chimney is formed with a second bulge
or enlargement & level with the top of the crutch supporting the incandescent
mantle, or in other words level with the knot in the mantle, for the purpose of
preventing to a certain extent the cracking of the chimney.
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. A chimney for incandescent gas lamps, characterized by being formed with
a bulge towards the exterior above the portion retained in the gallery of the
burner bracket so forming an annular surface at right angles with the axis
of the chimney in which apertures c are provided.
2. In chimneys as claimed in Claim 1 apertures e obtained by forming inci-
sions in the annular surface b and then widening the incisions by bending their
edges downward.
3. In chimneys as claimed in Claim 1, the formation of a bulge or enlarge-
ment in the chimney at the level of the knot of the incandescent mantle.
A
1 1. ሰ
Tonuous 1900
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.