Improvements in Lamps or Lanterns for Burning Petroleum and the like.
Year: 1898

page_text: Date of Application, 22nd Nov., 1898
Complete Specification Left, 22nd Aug., 1899-Accepted, 14th Oct., 1899
PROVISIONAL SPECIFICATION.
Improvements in Lamps or Lanterns for Burning Petroleum and
the like.
I, GEORG WILHELM LYTH, of Bryggaregatan 7, Stockholm, Sweden, Philo-
sophical Instrument Maker, do hereby declare the nature of this invention to be as
follows:-
i
This invention relates to improvements in lamps or lanterns (hereinafter called
lamps) suitable for burning petroleum or the like, adapted to burn for a long
time without attention, and provided with a burner having a central air-tube
communicating through an opening in the bottom of the oil-reservoir with a
chamber under the bottom of said reservoir to which chamber the air is led
from the space inside the lens-system by pipes passing through the oil
reservoir. The object of the invention is to produce a more intense and uniform
light during the whole time it is burning than has been the case with the lamps
hitherto known. This result is effected by preventing water and dirt from getting
to the wick.
The accompanying drawing represents by way of example a part of
such a lamp in accordance with this invention partly in elevation and
partly in vertical section. 1 is the burner provided with a central air passage 2
which leads from the air chamber 4 beneath the reservoir 3 for the combustible
material such as petroleum. 6 is a tube leading from the space 5 inside the
circular lens into the air chamber 4.
The oil supplied to the reservoir 3 generally contains water and other
impurities; impurities also enter the said reservoir at the filling operation and
also at the tending of the burner. Such impurities settle at the bottom of
the reservoir and in the lamps hitherto employed come in contact with the wick
through the small holes provided at the lower end of the wick-tube 7, whereby the
lighting power of the burner becomes more or less reduced. In order to remove
this drawback the bottom 8 of the oil reservoir 3, which is preferably made some-
what convex, i.e. sloping down towards the centre, is provided at its middle
portion according to this invention with a downwardly extending cavity or
chamber 9 which depends into the air reservoir 4. The central air tube 2 of the
burner is prolonged downwards to the bottom of the said chamber which is pro-
vided with an opening at the bottom of the tube as shown. The wick tube 7
also extends down into this chamber but is closed at its lower end, the holes 10
for admitting the oil to the wick being located at or about the level of the top
of the chamber 9. The water and other heavy impurities collect in the lower
part of the chamber 9 and do not ascend to the holes 10 so that only pure petroleum
enters through them to the wick.
Water, spilt oil and other impurities have also been liable to collect in the
lens chamber 5 and enter the oil reservoir by the hole through which the burner
is inserted. To prevent this the lens chamber may be provided with outlets
which are advantageously so arranged that the flame is not disturbed by any
draught passing through them. For this purpose the oil reservoir 3 is at one or

page_text: several places penetrated by tubes 11, preferably inclined as shown, and issuing
through the top 12 of the oil reservoir 3 and opening at the bottom into the air
chamber 4, but in order that the refuse liquid passing through said tubes shall
not clog up the small air holes 13, 13 in the bottom of said chamber, they open
into special chambers 14, provided at the bottom with a wide outlet hole or
holes 15. This outlet hole 15 in the chamber 14 is not located immediately under
the lower mouth of the tube 11 but to one side thereof. By this arrangement of
the outlet from the lens chamber all objectionable draught is prevented as the air
entering by the hole 15 is stopped at first in the chamber 14 and must change its
direction before entering the tube 11 and by the inclination of said tube it is not
directed against the flame but against the wall of the lens chamber.
In order that spilt oil etc. shall not enter the air chamber 4 by the tubes 6
the latter are arranged to project a little above the bottom of the lens chamber.
For facilitating the cleaning the air chamber 4 is composed of an annular
flange 16 soldered to the bottom of the oil reservoir 3 round which flange the
vessel 17 fits and is fastened thereto in any suitable way. The chamber 14 suit-
ably consists of a tube fixed to the bottom of the vessel 17 which tube upon
fastening the said vessel 17 in place forms a tight joint against the bottom of the
oil reservoir 3 by means of a ring 17" of felting or other suitable material.
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.
.
Improvements in Lamps or Lanterns for Burning Petroleum and
the like.
I, GEORG WILHELM LYTH, of Bryggaregatan 7, Stockholm, Sweden, Philo-
sophical Instrument Maker, 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 improvements in lamps or lanterns (hereinafter called
lamps) suitable for burning petroleum or the like, adapted to burn for a long
time without attention and provided with a burner having a central air tube
communicating through an opening in the bottom of the oil reservoir with a
chamber which is located under the bottom of the said reservoir and to which the
air is led from the space inside the lens system by pipes passing through the oil
reservoir. The object of the invention is to produce a more intense and uniform
light during the whole time of burning than has been the case with the lamps
hitherto known. This result is effected by preventing water and dirt from getting
to the wick.
The drawing filed with my Provisional Specification represents by way of example
a part of such a lamp in accordance with this invention partly in elevation and
partly in vertical section. I is the burner provided with the central air passage 2,
which leads from the air chamber 4 beneath the reservoir 3 for the combustible
material such as petroleum. 6 is one of the tubes leading from the space 5 inside
the annular lens into the air chamber 4.
The oil supplied to the reservoir 3 generally contains water and other

page_text: impurities; impurities sometimes also enter the said reservoir when the burner is
being attended to. Such impurities settle at the bottom of the reservoir and, in
the lamps hitherto employed, come into contact with the wick through the small
holes provided at the lower end of the wick-tube 7, whereby the lighting power of
the burner is more or less reduced. In order to remove this drawback the
bottom 8 of the oil reservoir 3, which is preferably made somewhat convex out-
wardly ie., to slope down towards the centre is provided at its middle portion
according to this invention with a downwardly extending chamber 9 which
depends into the air chamber 4. The central air tube 2 of the burner is prolonged
downwards to the bottom of the chamber 9 which is provided with an opening at
the bottom of the tube as shown the air tube 2 forming the inner annular wall
of the chamber 9. The wick-tube 7 also extends down into the chamber 9 but
is closed at its lower end, and the holes 10 for admitting the oil to the wick are
located at or about the level of the top of the chamber 9. The water and other
heavy impurities collect in the lower part of the chamber 9 and do not ascend to
the holes 10 so that only pure petroleum enters through them to the wick.
Water, spilt oil, and other impurities have also been liable to collect in the
lens chamber 5 and enter the oil reservoir by the hole through which the burner
is inserted. To prevent this, the lens chamber may be provided with drainage out-
lets, which are advantageously so arranged that the flame is not disturbed by any
draught passing through them. For this purpose the oil reservoir 3 is at one or
several places passed through by one or several tubes 11, which or each of which
is preferably inclined as shown, and terminates, as shown, at its open upper end
flush with the top 12 of the oil reservoir 3 and opens at the bottom into the air
chamber 4, but in order that the refuse liquid passing through the tube or
tubes 11 may not clog up the small air holes 13, 13 in the bottom of the chamber 4,
it or each of them opens into a special chamber 14, which is provided at the
bottom with a wide outlet hole or holes 15. The outlet holes 15 in each
chamber 14 is or are not located immediately under the lower mouth of the corre-
sponding tube 11 but laterally thereto. By this arrangement of the drainage
outlet or outlets from the lens chamber all objectionable draught is prevented, as
the air entering by the hole or holes 15 is stopped at first in the chamber or
chambers 14 and must in the or each chamber change its direction before entering
the corresponding tube 11, and in consequence thereof the inclination of the
tube 11 it is not directed against the flame but against the wall of the lens
chamber.
In order that spilt oil, etc., may not enter the air chamber 4 by the tubes 6
the latter are arranged to project a little above the bottom of the lens chamber.
For facilitating the cleaning, the air chamber 4 comprises an annular flange 16
which is soldered to the bottom of the oil reservoir 3 and round and to which
a vessel 17 containing the air holes 13 fits and is fastened in any suitable way.
The or each chamber 14 suitably consists of a tube which is fixed to the bottom
of the vessel 17 and which upon fastening the vessel 17 in place, forms a tight
joint against the bottom of the oil reservoir 3 by means of a ring 17 of felting
or other suitable material.
Having 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:-
1. A lamp or lantern for burning petroleum and the like, adapted to burn for
a long time without attention and provided with a burner having a central air-
tube communicating through an opening in the bottom of the oil reservoir with an
air chamber located under the bottom of the said reservoir and supplied with air
from the space inside the lens system by pipes passing through the oil reservoir
in which for the purpose of preventing water and other impurities from getting
to the wick in the wick-tube, the bottom of the oil reservoir 3 is provided at its
middle portion with a downwardly extending chamber 9 depending into the air

page_text: chamber 4 and the wick-tube 7 is closed at its lower end and provided with inlet
holes 10 for the oil at or about the level of the top of the chamber 9.
2. A lamp or lantern of the kind referred to in the preceding claim, in which
for the purpose of preventing water and other impurities from getting to the
wick in the wick tube, the oil reservoir 3 is passed through by one or more
tubes 11 which or each of which has its upper open end at the top 12 of the oil
reservoir 3 and opening into the lens chamber 5 and its lower end opening into
a special chamber 14 which is in the air chamber and is provided at the bottom
with a wide hole or holes 15.
3. A lamp or lantern constructed, arranged, and operating, substantially as
herein before described with reference to and shown in the drawing, filed with
my Provisional Specification
of August 1899.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.
Dated this 22nd day of August 1899.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.