IMPROVEMENTS IN LAMPS
Year: 1882

page_text: LETTERS PATENT to Charles William Siemens of No. 12 Queen Anne's Gate
Westminster in the County of Middlesex for an invention of "IMPROVEMENTS
IN LAMPS "
.
PROVISIONAL SPECIFICATION left by the said Charles William Siemens at
the Office of the Commissioners of Patents on the 13th July 1882.
CHARLES WILLIAM SIEMENS of N° 12 Queen Anne's Gate Westininster in the
County of Middlesex "IMPROVEMENTS IN LAMPS
:
כל
My Invention relates to a construction and arrangement of lamps whereby I am
enabled to utilize a large portion of the heat of the products of combustion in
beating the air supply to the burner, and thus to cause production of a brilliant
light. For this purpose I superpose on the glass chimney a metal chimney which
is made with fins or ribs exposing greatly extended surface both inside and outside.
I enclose the external ribs within a casing of perforated metal or wire gauze and
from the space thus enclosed I provide an annular passage between the glass
chimney of the lamp and an outer casing of glass or translucent material down to
a chamber surrounding the burner which may consist of a number of separate
tubes. The products of combustion ascending the chimney deliver a large portion
of their heat to the internal fins or ribs of the upper metal chimney and the
external fins or ribs being heated by conduction deliver heat to the air which enters
through the perforations of their casing passes over the surfaces of the ribs and
descends the annular channel to supply the burner. Instead of making the
descending air channel as an annular space within a casing surrounding the glass
it may be a separate channel at the side of the lamp, in which case it may be of
metal and no external casing of the glass chimney is required. When this
arrangement is adopted the air may be made to traverse several times to and fro
across the ribbed portion of the metal chimney, which in this case would have its
external ribs arranged horizontally.
The burner may be of the Bunsen kind in which the gas is in the first place
mixed with a certain amount of air but does not receive its full supply for
combustion until it issues from the nozzle of the burner. In this case, as the flame
itself has little luminosity, I cause it to play upon refractory material such as
lime or magnesia which being heated by it to incandescence gives out a brilliant
light.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed
by the said Charles William Siemens in the Great Seal Patent Office on the
13th January 1883.
CHARLES WILLIAM SIEMENS of No 12 Queen Anne's Gate, Westminster, in the
county of Middlesex "IMPROVEMENTS IN LAMPS "
My invention relates to a construction and arrangement of lamps whereby I am
enabled to utilise a large portion of the heat of the products of combustion in
heating the air supply to the burner, and thus to cause production of a brilliant
light. For this purpose I superpose on the glass chimney a metal chimney, which
is made with fins or ribs exposing greatly extended surface both inside and outside.
I enclose the external ribs within a casing of perforated metal or wire gauze, and
from the space thus enclosed I provide an annular passage between the glass
chimney of the lamp and an outer casing of glass or translucent material down to
a chamber surrounding the burner, which may consist of a number of separate
tubes. The products of combustion, ascending the chimney, deliver a large portion
of their heat to the internal fins or ribs of the upper metal chimney and the
external fins or ribs being heated by conduction deliver heat to the air, which
enters through the perforations of their casing, passes over the surfaces of the ribs
and descends the annular channel to supply the burner. Instead of making the
descending air channel as an annular space within a casing surrounding the glass,
it may be a separate channel at the side of the lamp, in which case it may be of
metal, and no external casing of the glass chimney is required. When this
arrangement is adopted the air may be made to traverse several times to and fro
across the ribbed portion of the metal chimney, which, in this case, would have its

page_text: external to the glass of the lamp, In this case the ribs or fins are made horizontal k
on theoutside, and vertical 7 on the inside.
Having thus described the nature of my invention and in what manner the same
is to be performed, I claim :-
First:—Superposing on the glass chimney of a lamp a metallic chamber
presenting extended surface and having air passages communicating by a
descending channel with the chamber of the burner below, so that the heat of the
ascending products of combustion is in great part utilised for heating the air
supplied to the burner.
Second-The construction of lamp substantially as described, with reference to
Figs. 1, 2 and 3.
Third: The modified construction of lamp substantially as described with
reference to figs: 4 and 5.
Fourth-The construction of lamp substantially as herein described with
reference to figs: 6, 7 and 8.
In witness whereof, I the said Charles William Siemens have hereunto set
my hand and seal this Twelfth day of January, in the year of our Lord, one
thousand eight hundred and eighty-three
NCותAM CTnu
(ONT)
ANTIATA