Improvements in Incandescent Lamps for Liquid Fuel.
Year: 1895

page_text: Date of Application, 25th Feb., 1895-Accepted, 6th Apr., 1895
COMPLETE SPECIFICATION.
Improvements in Incandescent Lamps for Liquid Fuel.
We LOUIS FRIEDLÄNDER, of 16 Neue Königstrasse, Berlin, Lamp Manu-
facturer, and THEODOR MÜLLER of 11 Mendelssohnstrasse Berlin, Master
Locksmith, both in the Empire of Germany 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 relates to lamps in which a volatile liquid fuel is used such as
petroleum-spirit, benzine, ligroin or other hydrocarbon. Heretofore lamps have
been constructed in which such fuel has been fed from a receptacle to a burner at
a lower level and vaporized to produce an illuminating gas which is thereupon
burnt in the ordinary way, but these have the disadvantage of unpleasant smell
and improvements that have been made have been directed to obtain a combination
of fuels which will produce a better combustion.
The present invention is intended to first fully convert the fuel into gas and to
cause its mixture with an adequate proportion of air so as to produce, upon
combustion, a considerably higher temperature suitable to bring to a white head a
solid and incombustible body placed in the flame, such as an incandescent mantle
of the "A tier or similar system. The complete gasifying of the liquid fuel and
its mixture with air produces a gaseous mixture of very small illuminating power,
but by the addition of an incandescent stationary body a light equal to an
incandescent gas light is obtained therefrom.
The annexed drawing illustrates means for carrying this invention into effect,
and adapted for the employment of benzine. In the section through this lamp
shown in the drawing, A is the reservoir for the liquid fuel and B is a U-shaped tube
leading from the base of reservoir A to the burner which is at a lower level than
the reservoir. At the mouth of the tube B is a valve S which also forms with its
chamber or body the gasifying chamber. From the tube above or beyond the
valve S there is led a curved pipe E which ends in a small nozzle or fine drawn
orifice F. D is the handle for regulation of the valve. The passage from the
valve to the burner is continued from the valve body through the nozzle K which
is surrounded by the outer nozzle L rising in the outer tube M having orifices N
for admission of air and leading to an ordinary "Auer" incandescent burner
comprising the chamber P and the mantle O. Qis the chimney carried by the
gallery R. G is a trough surrounding the tube B immediately below the valve
body S and the nozzle F which is directed towards the said valve body.
If a small quantity of spirit or other suitable fuel is placed in the trough G
and set alight the fuel in the valve body will be vaporized and in the opening of
the valve it will issue through the nozzle K and also through the pipe E and
nozzle F at which latter place it takes flame from the fuel burning in the trough G
and when the latter is exhausted this flame from nozzle F will continue to heat
the valve body and convert the fuel into gas. The gas passing through the
nozzles K and L mixes with air entering at N and forms a mixture which may
be lit in the ordinary way and will heat the mantle in a similar manner to the
gas used for other incandescent lights.
Having now particularly described and ascertained the nature of this said inven
tion and in what manner the same is to be performed we declare that what we
claim is ;-
1. In a lamp the combination of a holder for supplying a liquid fuel, means for

page_text: gasifying said fuel and for mixing air therewith and for supplying said gaseous
mixture for combustion and heating an incandescent body to cause the emission of
light.
2. A lamp having a reservoir A, a tube B therefrom, a valve S and means for
heating the valve body or chamber for evaporating liquid fuel supplied from
reservoir A by the tube B, together with a burner with air feed supplied with said
evaporated fuel and an incandescent body adapted to be heated by said burner.
3. A. lamp substantially as above claimed having in combination with the
valve body S, a pipe E terminating with a nozzle F, and a trough G, for the
purposes specified.
Dated this 25th day of February 1895.
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, W.C.,
Agents to Applicants.