A Combined Flame and Incandescent Lamp.
Year: 1893

page_text: Date of Application, 28th Feb., 1893
Complete Specification Left, 17th Nov., 1893-Accepted, 23rd Dec., 1893
PROVISIONAL SPECIFICATION.
A Combined Flame and Incandescent Lamp.
I, FREDERICK SIEMENS of 10 Queen Anne's Gate, Westminster in the County
of London Engineer do hereby declare the nature of this invention to be as
follows:-
In all lamps, the products of combustion pass exnnot be entirely utilized by the
away in a highly heated condition,
even in those of the regenerative kind this
regenerators employed. The object of my invention is to utilize, for the purpose
of producing light, much of the heat thus wasted, thereby increasing the
illuminating power of a lamp or proportionately economising the gas or other fuel
consumed by the lamp.
For this purpose, I arrange in the path of the hot products of combustion, after
they leave the luminous flame of the lamp, a network or other form of refractory
material which is rendered incandescent by the heat of the products of combustion
and thus is made to give light in addition to that given by the lamp flame itself.
When the lamp is of the regenerative kind, the products of combustion after
passing the incandescent material, being still at a high temperature, are led through
suitable passages for heating the air supplied to the flame.
The refractory material, employed as above described, may be of the same kind
as those already used in what are known as incandescent gas lamps, in which the
incandescence is produced by the heat of a Bunsen or non-luminous flame.
I do not however limit myself to the materials thus employed, nor to the forms.
in which they are employed.
Dated this 28th day of February 1893.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION.
A Combined Flame and Incandescent Lamp.
I, FREDERICK SIEMENS, of 10 Queen Anne's Gate, Westminster, in the County
of London, 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 :—
In all lamps, the products of combustion pass away in a highly heated condition;
even in those of the regenerative kind this heat cannot be entirely utilized by the
regenerators employed. The object of my invention is to utilize for the purpose
of producing light, much of the heat thus wasted, thereby increasing the
illuminating power of a lamp or proportionately economising the gas or other fuel
consumed by the lamp.
For this purpose, arrange in the path of the hot products of combustion, after
they leave the luminous flame of the lamp, a network or other form of refractory
material which is rendered incandescent by the heat of the products of combustion
and thus is made to give light in addition to that given by the lamp flame itself.
When the lamp is of the regenerative kind, the products of combustion after
passing the incandescent material, being still at a high temperature, are led through
suitable passages for heating the air supplied to the flame.
The refractory material employed as above described, may be of the same kind
as those already used in what are known as incandescent gas lamps, in which the
incandescence is produced by the heat of a Bunsen or non-luminous flame.

page_text: I do not however limit myself to the materials thus employed, nor to the forms
in which they are employed.
Figure 1 of the accompanying drawings is a vertical section and Fig. 2 is a plan
of a circular flame gas lamp provided, according to my invention, with a network of
refractory material, heated by the flame. The gas issues from a number of small
tubes G circularly arranged in the passage A which has an inwardly projecting
lip directing the ascending air on the root of the flame. A central stem S which
may be hollow as shewn supports a network hood N of suitable refractory material
which is rendered incandescent by radiation from the luminous part of the flame F,
and by contact with the products of combustion at its upper part which, though
non luminous, are at a very high temperature.
Fig. 3 is a section and Fig. 4 a plan of a lamp suited for the ceiling of an
apartinent or carriage. In this case, the flames from two inclined burners G are
'directed on a network screen N.
Fig. 5 is a section and Fig. 6 is a plan of a lamp with circular burner G
surmounted by an inverted network cone N.
Fig. 7 is a section and Fig. 8 is a plan of a regenerative gas lamp having its
flame F proceeding from a row of tubes G circularly arranged in the air channel A.
The products of combustion pass through a pervious body N of suitable refractory
material, heating it to incandescence, and descend a central channel H to a
lateral outlet C leading to a chimney.
The air ascending the channels A a is heated by conduction from the metal
walls.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:-
In combination with a lamp burner or set of burners giving a luminous flame,
refractory material made in form and arranged in position to be rendered incan-
descent by the products of combustion, substantially as described.
Dated this 17th day of November 1893.
ABEL & IMRAY,
Agents for the Applicant.