Year: 1886

page_text: 1, HERBERT JOHN HADDAN of 67 Strand in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has for its object a more effectual preliminary heating of the fresh
air for feeding the flame in gas and other lamps, and consists in the use of two
concentric tubes arranged above the burner of the lamp the said tubes having a
free-space between them and each tube being provided with outwardly radiating ribs
formed, with the tubes, of heat conducting materials. The outer tube is also so
channelled or corrugated that the radial ribs of the inner tube enter the recesses of
the outer tube and thereby cause the fresh air to move in a zig-zag path along the
wall of the outer tube, when a current of fresh air is conducted between the tubes.
By arranging the two said tubes in the chimney of the lamp, so that the escaping
gases of the lamp flow along the outside of the corrugated and ribbed tube, the latter
is heated and transfers its heat to the fresh air.
These ribbed heating tubes allow of an energetic heating, but offer however, on the
other hand, a considerable resistance to the necessary flow of the air in the lamp,
therefore in most cases, unless very high chimneys are used, an arrangement will be
required for the generation of an artificial air current in the lamp. This purpose may
be attained by allowing the air to enter at a low point into branch tubes of the lamp,
the said branch tubes leading downward and terminating below the burner so that a
sufficient difference of pressure is produced, between the entrance of the air into the
lamp and its escape therefrom.
Or, an artificial air current may be produced in the lamp by means of a ventilator
actuated by clock work for the purpose of overcoming the resistance of the ribbed
hos

page_text: If the chimney is high enough it is often sufficient to merely initiate the circulation
of the air by a primary impulsion, the chimney sufficing for the continuation of the
flow. This impulsion may suitably be produced by a piston, arranged in one of the
air introduction tubes and adapted to be drawn outwardly by a projecting bar. On
releasing this bar a spiral spring propels the piston forward again, producing thereby
a sudden air current, which initiates the flow of the air between the ribbed tubes and in
the other portions of the lamp.
The improved lamp may be arranged within glass globes, and may be used with a
standing or suspended lamp.
The chimney may be formed in one piece with the cover or dome, from glass or
porcelain, especially with such lamps as are intended to throw light upwards.
Dated this 23rd day of August 1886.
HERBERT & Co.,
67, Strand, W.C, Agents.

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1, HERBERT JOHN HADDAN, of 67, Strand, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of this invention, a communication to me
from abroad by August Jahnke, of Hamburg, in the Empire of Germany, Engineer,
and in what manner the same is to be perforined to be particularly described and
ascertained in and by the following statement:—
This invention has for its purpose a more effectual preliminary heating of the fresh
air for feeding the flame in gas and other lamps.
Referring to the accompanying drawings, Sheet I-III, Fig. 1 is a longitudinal
section, Fig. 2 a cross section along line a-a, and Fig. 3 a cross section along
line -b of the improved lamp, Figs. 4-11 showing modifications.
R is an Argand burner, burning downwards and receiving the gas through the
tube r, B is a tube or canal, standing upon the burner, for leading the heated air to the
latter, and is provided outwardly with projections n n. Round this tube is arranged
an outer tube C closed above and corrugated or ribbed and having likewise outward
projections m. The whole lamp is enclosed by the glass globe G and the
chimney s.
The fresh air enters through the tubes d d into the space between C and B and flows
to the flame in the direction indicated by arrows, the utilised air escaping through the
interstice between the chimneys and the tube C.
Owing to the corrugations of the tube C and the inner projections or radial ribs n
and the outer projections m, a particularly favorable absorption of the heat from the
escaping gases is effected by the tube C, and likewise a very energetic transmission
of this heat to the fresh air flowing to the burner. To heat this air in a more uniformi
manner, the space between B and C may be filled with metal chips or other suitable
loose heat-conducting material.
The lamp shown by Fig. 4 in longitudinal section and by Fig. 5 in cross section
along line a¹a is a modification, the fresh air enters at the lower perforated
extremities e of tubular arms E, which are elongated downwardly. By this
arrangement a sufficient difference of pressure is produced between the entrance of
the air into the lamp and its escape therefrom, without necessitating this pressure to
be merely produced by the length of the chimney. The hot air passes between B and C
downwards to the burner.
For the purpose of producing rapidly a circulation of the air in the lamp after
lighting it, a piston k Fig. 6, may be suitably employed, which leaves the air channels
open by the action of a spiral spring, which is however adapted to be drawn outwardly
in a cylinder h connected with inlet tubes, and, when released, presses the air into the
tubes and through the lamp. In most cases one impulsion suffices to initiate the
circulation. In the lamp, Fig. 6, the atmospheric air flows through the lower part
into the cylinder h and to the heater and burner.

page_text: When the piston k is drawn downwardly and then released, it rebounds upwardly
and presses the air from into the lamp, whereby the circulation is at once produced.
This circulation may also be artificially produced and maintained by pressing the
air by means of a worm or pinion, as represented by Fig. 8, u being a ventilator driven
by clock-work and arranged in a lateral tube of the lamp to press the air to the
heater.
Fig. 10 shows a lamp in which all tubes are situated above the flame. The chimney
is connected with a glass or porcelain dome D, so as to allow the light to be thrown
upwards.
Fig. 11 represents the improved heating device in combination with a paraffin-lamp,
J being the reservoir for the fuel, the burner, through which flows the fresh air from
below. The air enters from above into the space between B and C and flows
downwards in the same towards the flame burning at . The flame is supplied with
fresh air from outside through the channel y, the "utilised air escaping through the
globe F.
Haying now particularly described and ascertained the nature of the said invention
and in what manner the same is to be performed, I declare that what I claim is:
In a lamp in which the preliminary heating of the air is effected in the space between
an outer and an inner tube.
1. The application of downward tubes for the admission of air substantially as and
for the purpose set forth.
2. The application of a piston for initiating the circulation of air within the lamp
substantially as described and illustrated.
3. A ventilator actuated by clock-work, for the purpose referred to in Claim 2,
substantially as set forth:
4. The application of a transparent upper and lower globe with an intermediate
metal ring with horizontal channels for the supply of air, substantially as described
and illustrated.
Dated this 20th day of May 1887