Improvements in or connected with Lamp Chimneys.
Year: 1899

page_text: Date of Application, 7th Sept., 1899-Accepted, 4th Nov., 1899
COMPLETE SPECIFICATION.
Improvements in or connected with Lamp Chimneys.
I, AUGUSTE LECOMTE, of 172, Avenue Victor-Hugo, Paris, in the Republic of
France, Civil Engineer, do hereby declare the nature of this invention, and in
what manner the same is to be performed,' to be particularly described and ascer-
tained in and by the following statement:-
The present invention has for its object the provision of a chimney applicable
to burners for incandescent lighting, and which is adapted to give a far greater
degree of incandescence and a much larger amount of light.
By way of example I have illustrated my new chimney in the annexed draw-
ing.
Fig. 1 shows in section a chimney with a mica disc and its position when it
A is the chimney; B is
is fixed upon the gallery of an incandescent burner.
the disc; C is the head of the burner; and D) is the incandescent mantle.
Fig. 2, shows in section a chimney with a mica disc but which has a socket
or annular recess for holding the disc which does not extend beyond or is flush
with, the exterior of the chimney.
Fig. 3, shows in section a chimney fitted with a glass disc.
In order that combustion may be complete it is necessary that the air previously
heated be admitted to the flame from the commencement of the combustion, and
that once the flame has received all the air which it needs, that the draught be
then diminished or reduced so that an influx of supplementary air does not obtain
admission to cool down the flame.
In Fig. 1, it will be seen that the air admitted as shown by the arrow marked 1
will be heated by contact with the head C, and will be then violently projected
against the mantle as is indicated by the arrow marked 2, and lastly that it
will pass away from the mantle as is indicated by the arrow marked 3 and be
discharged into the atmosphere.
All the conditions then above specified are satisfactorily fulfilled by this chim-
ney, and above the disc the draught will be reduced in accordance with the pro-
portion of the surfaces of the opening in the disc with the upper opening of the
chimney; in the case of the chimney shown in the drawing, the draught is 2
times smaller at the upper part of the chimney than it is at the level of the
disc B.
The arrangement of Fig. 2, which resembles that of Fig. 1 is specially intended
for use with globes. With this object the annular recess in which the disc is
lodged does not exceed the diameter of the body of the chimney.
The mica disc may be replaced by a glass disc, Fig. 3, which will rest by reason
of its own weight upon a rib or annular projection on the chimney.
Chimneys of this description are practically unbreakable because they only
become slightly heated their walls being situated much further off from the flame
then is the case with straight chimneys. They are suitable for all burners which
require a large influx of air, such as incandescent burners with mantles. In the
latter case their use admits of satisfactory results being obtained with very low

page_text: pressure of gas, and the increase of light produced by the use of the disc chimney
may be as much as 40 per cent.
į
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:
1. A chimney with a disc placed in the interior, this disc being made of mica,
glass, or any other suitable material, and the said disc being moreover of various
shapes and supported in a number of ways in the interior of the chimney, sub-
stantically as described.
2. The combination and arrangement of the chimney as has been herein before
mentioned and for the purpose specified, and according to the accompanying
drawing.
J. P. BAYLY,
18, Fulham Place, London, W.,
Agent for the Applicant.