Improvements in Incandescent Lamps for Liquid Fuel.
Year: 1895

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Date of Application, 16th Apr., 1895-Accepted, 8th June, 1895
Improvements in Incandescent Lamps for Liquid Fuel.
We LOUIS FRIEDLÄNDER, of 16 Neue Königstrasse Berliu, Lamp Manufacturer
and THEODOR MÜLLER of 11 Mendelssohnstrasse, Berlin,. 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 that class of lamps in which liquid fuel is first converted
into gas by means of an auxiliary flame, then mixed with air and the lighted
gas mixture directed onto an incandescent body for the purpose of bringing the
latter to a glowing heat in order to emit light.
In the annexed drawing, Fig. 1 is a longitudinal section of such lamp-
Fig. 2 is a section of part thereof at right angles to Fig. 1. Fig. 3 is a plan upon
the section line xa. Fig. 1.
B is the pipe through which the liquid fuel, usually benzine, is supplied from
a reservoir placed at a higher level than the gasefier. The latter formed of a
valve chamber or casing C which when the lamp is not in usc is closed by a valve D.
Below the valve seat, that is to say on the inlet side is a branch tube E which
communicates freely with pipe B and is curved upward and terminates in
a chamber F to which the communication from pipe E may be cut off or regulated
by a valve F. From the chamber F extends a small bore tube H terminating in
a downwardly directed fine nozzle G.
In the outlet of valve chamber C a short pipe I with a very fine bore k is screwed
and this pipe opens into a larger pipe K. The latter consists of the lower part K'
and the upper part K' reduced in diameter so as to form a shoulder on the lower
part. Over the upper part K' is slid the pipe L widened above to form the cup L'
of which the cover plate M is perforated with a number of small holes and carries
in the middle a rod N on which the mantle O is suspended. On the part K2 is also
placed a disk or tray P for supporting the crown of the burner, of which the arms Q
are fastened above and below to flanges a of the pipe L and carry the flange R
for receiving the glass chimney S.
To light the lamp the valve F is first opened so that the liquid fuel enters the
chamber F and passes thence through the tube H and nozzle G where it is lighted
so that the flame plays on the pipe E and heats the same and the valve chamber C
so as to evaporate the liquid fuel therein. After the flame at G has burnt for
a time the said parts will be filled with gas and only gas will issue at the nozzle G;
the valve D is then opened so that a fine stream of gas issues from the orifice k
of pipe I which has force enough to ascend the pipe K and to draw in air at the
base of the latter to mix with it before entering the cup L and from there the
mantle O. The latter is then lighted from above in the usual manner.
Experiments have proved that the construction of the shouldered tube K gives
a better working than a simple Bunsen tube with holes; it has also been found that
a gas mixture suitable for the present purpose is better produced therein. The
means for evaporating the fuel are also best made as represented herein, since on
the one hand this construction affords a large space for production of gas thus
tending to keep the production constant and the buruer steady, and on the
other hand the increased metallic surface heated by the flame increases the supply
of gas.

page_text: Having now particularly described and ascertained the nature of this said
invention and in what manner the same is to be performed we declare that what
we claim is ;—
In lamps for production of light by the gasefying of liquid fuel, mixture of air
therewith, and application of said mixture in state of combustion to an incandescent
body, the construction of the evaporating appliances comprising valve chamber C
having from its supply pipe a branching pipe E with valve F, pipe H and nozzle (
directed as described for the heating of pipe E and chamber C, and the construction
of the pipe K having the two parts K' K' connected with a shoulder in the manner
and for the purpose set forth.
Dated this 16th day of Anil 1005
HERBERT HADDAN & Co.,
18, Buckingham Street, Strand, London, W.C., Agents to Applicants.