Improvements in Incandescent Spirit Lamps.
Year: 1899

page_text: Date of Application, 20th Mar., 1899-Accepted, 13th May, 1899
Improvements in Incandescent Spirit Lamps.
I, narl Lehmann, of 127, Uhlandstrasse, Wilmersdorf, near Berlin, Germany,
Merchant, 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:-
Several attempts have heretofore been made to use spirit as a fuel for incan-
descence lamps, but without satisfactory results on account first of the volatile
nature of the fuel and secondly of the difficulty of producing the requisite blue
flame. Now this invention enables the result to be obtained in a simple wick
lamp without the use of either an auxiliary flame or a pump.
The accompanying drawing illustrates in vertical section a lamp according
to this invention. The spirit container a is mounted on a foot b provided with
air holes c and throughout the entire depth of the container there extends an air
tube d, one end of which opens into the foot b, whilst the other end forms
the burner head p, which is arranged at
from the level of the spirit in the container, as is necessary in order to
a comparatively small distance
insure the reliable upward suction of the liquid fuel by means of the wick.
The guiding of the wick e takes place between this tube and a guiding
cylinder f. The chimney holder g is of peculiar construction. In its outer wall
there are formed air-inlet holes h through which air reaches the interior of the
holder, where it impinges against a partition whereby it is compelled to flow
downward and then to rise up between the partition i and the cylinder f, at the
upper part of which it comes into contact with the flame of the wick e.
In addition, there are provided in the upper portion of the holder, apertures s
through which air passes to ascend between the chimney o and the mantle n
the sucking action of this current of air produces a lengthening of the flame.
The flame is spread by means of a disc k, which is attached to a perforated
plate by means of a small stem m. Above the flame, there are arranged in the
usual manner the mantle n and the chimney o.
In using such a lamp spirit gas and air are not mixed together for the purpose
of producing a blue flame, but the usual liquid or wick flame is converted by
means of the supply of a considerable quantity of air at a great velocity, into an
intense blue flame.
It is advisable to employ for this lamp a chimney having a cylindrical lower
portion and a slightly conical upper portion in order to cause or assist in causing
the flame to conform exactly to the shape of the mantle.
Having now particularly described and ascertained the nature of the said in-
vention, and in what manner the same is to be performed I declare that what I
claim is:-
1. An incandescence lamp designed to burn spirit comprising a container
having throughout its depth an air supply tube d whose upper end, which forms
he burner head, is arranged at such a distance from the bottom of the container

page_text: that in use it will be comparatively near to the level of the liquid spirit in the
container, and a holder g adapted to supply air to the wick flame in considerable
quantity and at great velocity, for the purpose of converting the wick flame into
the intense blue dame necessary to render the mantle incandescent.
2. The improved incandescent spirit lamp shown in and described with refer- 5
ence to the accompanying drawing.
F. WISE HOWORTH,
46, Lincoln's Inn Fields, London, W.C., Agent for the Applicant.