Improvements in Chimneys for Incandescent Petroleum Lamps
Year: 1898

page_text: Date of Application, 4th Nov., 1898-Accepted; 7th Jan., 1809
CUMFLUID DEVITICATION.
Improvements in Chimneys for Incandescent Petroleum Lamps::
I, GEORG KRON, of 7; Niels Juelsgorde; Copenhagen, in the Empire of Denmark,
Engineer, 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:-
This invention has reference to petroleum lamps and more particularly to glass
chimneys for such lamps.
In lighting the incandescent petroleum wick-burners it happens very often and
easily that the incandescent mantle will be spotted with lamp black produced: by
a. too, ready evaporation of the fluid. These spots produce a decrease of the air
current and an increase of radiation of heat, since said spot of lamp black in
contact with the flame exclusively produce rays of heat, whereby the amount, or
deposit of lamp black will also be increased in such a manner, that in a com-
paratively short time the incandescent mantle will be completely lined with lamp
black and soon become unsuitable for lighting. The deposits of lamp black can
also occur in a longer lapse of time when the degree of heat of the ambient air is
increased' or when this air becomes less pure.
The object contemplated by my invention is to do away with all these disadvan-
tages and I attain this object by the glass chimney more fully and clearly pointed
out and claimed hereinafter and illustrated in the accompanying drawing.
And in order that my invention may be thoroughly understood I now proceed
to describe the accompanying drawing thereof reference being had to letters and
figures marked thereon.
Fig. 1, is a sectional view of an incandescent petroleum burner, provided with
my improved chimney.
Fig. 2, shows a slightly modified chimney, with which the perforations, herein-
after referred to, are protected by a second cylindrical glass, surrounding the
chimney proper, so that the air is forced to travel in the direction of the arrow.
a indicates the chimney proper, 6 the perforations provided in the wall of
said chimney.
My improved chimney is formed by a simple cylinder a without bulge which at
the height of the luminous zone of the incandescent body, is provided with a
plurality of perforations b.
The air sucked in through said perforations is forced in to the flame whereby the
incandescent points which may be found there, are transformed into a blue flame
without producing light, thus preventing any deposit of lamp black upon the
incandescent body.
The experiments have established that a sufficient light effect is produced by
an excess of air, so that an increase of heat, occuring after a continuous lighting
does not result in any deposit of lamp black produced by the excessive evaporation
promoted thereby.
The glass chimney shown in Fig. 2, of the accompanying drawing, is also formed
by a straight cylinder a without any hulge and provided with a plurality of
perforations made at the height of luminous zone of the incandescent body.

page_text: The perforated cylinder a is furthermore provided with a second cylinder for a
portion of its length and being slightly out of contact with the former, said
cylinder being intended to prevent the flickering of the flame, which may be
produced by accidental air currents on account of the presence of the perforations b.
The chimney thus constructed, may be very advantageously employed with
street lamps and the like.
I wish it to be understood that I do not limit myself to the precise arrangement
and construction shown in the accompanying drawing since my improved
chimney may be constructed in various manners without departing from the scope
of the invention.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
1. A chimney for incandescent petroleum lamps, without any bulge and pro
vided with a plurality of perforations or air inlet-holes arranged at the height of
the luminous zone of the incandescent body, substantially as set forth.
2. In a chimney for incandescent petroleum lamps, without any bulge and pro-
vided with a plurality of perforations or air inlet holes made at the height of the
luminous zone of the incandescent body, the means for preventing the flame
from flickering.
3. A chimney for incandescent petroleum lamps without any bulge and pro-
vided with a plurality of perforations or air inlet-holes made at the height of the
luminous zone of the incandescent body, said chimney being furthermore pro-
vided with a second cylinder surrounding the same for preventing the flame from
flickering, substantially as set forth.
Dated this 4th day of November 1898
J. P. BAYLY,
18, Fulham Place, London, W., Agent for the Applicant.