Improvements in Chimneys for Lamps.
Year: 1898

page_text: Date of Application, 28th Feb., 1898
Complete Specification Left, 7th Sept., 1898--Accepted, 5th Nov., 1898
Improvements in Chimneys for Lamps.
I, FRIEDRICH OTTO SCHOTT, Doctor of Philosophy, of Jena, in the Grand-Duchy
of Saxe-Weimar, German Empire, do hereby declare the nature of this invention
to be as follows:
In gas and other lamps, for the effective heating of the air supplied to the flame
and protection of the flame from external air currents, there has been suggested
to use below the ordinary gallery a second gallery closed at bottom and carrying
a second and wider chimney, extending upwards to about a level with the top
of the flame. The air on its way to the flame enters from above the space between
the two chimneys and thence passes into and upwards through the inner chimney.
The object of this invention, now, is to provide lamp chimneys for acting on
this principle with lamps made in the ordinary manner or without the necessity
for a second gallery. The bottom of the gallery is to be closed in case the whole
air supply is to pass to the flame as aforesaid through the space between the two
chimneys.
According to this invention the bottom end of the outer chimney is contracted
so that it will fit into the gallery, the inner chimney being also so shaped, that
it is likewise carried by the same gallery, openings being formed in the lower part
of the inner chimney for the passage of air to the flame, or the two chimneys
being so shaped that the inner chimney is supported by the outer chimney and in
this case the air openings through the inner chimney can be dispensed with, as
And such a
the air passes under the edge of the inner chimney to the flame."
lamp chimney without air holes but having an annular flange or two annular
flanges to enable it to be suspended instead of being supported at its bottom edge,
as usually, forms in itself a part of the present invention.
Dated this 28th day of February 1898
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.

page_text: and in what manner the same is to be performed, to be particularly described and
ascertained in and by the following statement:-
The invention relates to glass chimneys for incandescent lamps, in which gas,
hydrocarbon or spirit is burned, and consists in an improved chimney composed
of two separate parts and enabling the air of combustion to impinge on the lower
part of the incandescing mantle in a closed annular current, all parts of which
flow radially towards the centre, so that the air, while being deflected upwardly,
continues to be pressed against this mantle, whereby the illuminative effect is
considerably enhanced.
In the accompanying drawings
Fig. 1 is a central vertical section through the improved chimney,
Fig. 2 is a like section through a modified form of the improved chimney.
Fig. 3, 4 and 5 show three different forms of the upper component of the im-
proved chimney.
The complete chimney consists of an upper chimney a and lower chimney b.
The lower chimney 6 stands in the gallery c and supports the upper chimney a,
which for this purpose carries a circular bulge a¹. "By means of this bulge the
upper chimney is so suspended, that its lower part extends downwardly into
the upper widened part of the lower chimney and assists to confine the path of
the air of combustion. In Fig. 1 a horizontal row of bulges 60 is provided on the top
of the lower chimney 6 to serve as an abutment for the annular bulge a¹ of the
upper chimney, a similar row of bulges 6 below the first being arranged to present
a guidance for the upper chimney so as to avoid injury of the incandescing
mantle, when this chimney is inserted into or removed from the lower one.
Fig. 2 the upper edge of the lower chimney is contracted so as to directly support
the upper chimney, a series of holes 62 being provided at the top of the lower
chimney for the entrance of the air of combustion.
In
In the construction shown in Fig. 1 the circumferential bulge a¹ is carried by
the lower half, in that of Fig. by the upper half of the upper chimney a, but
it will require only slight modifications in. both constructions to adapt their lower
chimneys for an upper chimney as shown in Fig. 3 having the bulge a at an
equal distance apart from both ends so as to allow the upper chimney to be
reversed in case one end is damaged. The same advantage is presented by the upper
chimney shown in Fig. 4, which is adapted to be used in the construction of Fig. 1,
both of its bulges a¹ lying symmetrically as to the centre of the chimney a.
Fig. 5 shows the two bulges of Fig. 4 joined to form one large median bulge a¹,
which is represented to be of cylindrical shape, but which may evidently have any
other convenient form.
As to the operation of the improved chimney it will be observed, that no air is
allowed to enter through the bottom of the gallery c, which is tightly closed.
All air, which is to be let to the outer surface of the flame, descends through the
annular space between the widened part of the lower chimney and the lower
part of the upper chimney a and then enters the space between the lower edge
of the chimney a and the widening zone of the chimney b, that is to say that
approximately horizontal zone which connects the lower narrow and the upper
wide part of the lower chimney. Through this annular space the air flows in
a closed uniform current, which is everywhere radially directed so that it impinges
on the lower part of the incandescing mantle at all points of the circumference of
the same and, while being deflected upwardly and ascending along the flame,
remains in an intrinsic contact with the incandescing mantle.
Having now particularly described and ascertained the nature of said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
1. A chimney for incandescent lamps composed of two separate pieces, viz. a
lower chimney adapted to stand in the gallery and having a widened upper part,

page_text: and an upper chimney adapted to be suspended from the top of the lower chimney
and to extent downwardly into the lower chimney so that its lower edge leaves
only a small circular space above the widening zone of the lower chimney, both
component chimneys being fitted together without preventing the air from enter-
ing from above the hollow-cylindrical space between the upper part of the lower
chimney and the lower part of the upper chimney, so that the air of combustion
may flow downward this space and pass in a closed annular radially directed cur-
rent between the lower edge of the upper chimney and the widening zone of the
lower chimney so as to radially impinge on the lower part of the incandescent
mantle, essentially as described.
2. In a chimney for incandescent lamps composed as stated in Claim 1, the
arrangement of a horizontal row of bulges projecting inwardly from the top of
the lower chimney and a circumferential bulge projecting outwardly from the
upper chimney, essentially as described.
3. The general arrangement shown in Figure 1 of a chimney for incandescent
lamps composed as stated in Claim 1.
4. A lamp chimney having one or two outwardly projecting circumferential
bulges within the median third part of its length, essentially as shown in
Figures 3 to 5.
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1
1808
JOHNSONS & WILLCOX,
47, Lincoln's Inn Fields, London, W.C., Agents.