IM- PROVEMENTS IN LAMP GLASSES OR CHIMNEYS
Year: 1866

page_text: LETTERS PATENT to William Clark, of 53, Chancery Lane, in the County
of Middlesex, Engineer and Patent Agent, for the Invention of "IM-
PROVEMENTS IN LAMP GLASSES OR CHIMNEYS."-A communication from
abroad by Joseph Lallemand and Godefroi Auguste Guillaume Wagener,
Manufacturers, both of 29, Boulevart St. Martin, Paris.
Sealed the 18th April 1867, and dated the 31st October 1866.
PROVISIONAL SPECIFICATION left by the said William Clark at the
Office of the Commissioners of Patents, with his Petition, on the
31st October 1866.
I, WILLIAM CLARK, of 53, Chancery Lane, in the County of Middlesex,
Engineer and Patent Agent, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN LAMP GLASSES. OR CHIMNEYS," to be as
follows:-
This Invention relates to improvements in chimneys for lamps of all kinds,
the object being, 1st, the prevention of smoke in any lamp using a chimney.
2ndly, to produce a better light. 3rdly, to economize the consumption by
maintaining the oil at a nearly equal temperature, especially petroleum and
schist oils. 4thly, to prevent chimneys from breaking through the excessive:
hont of the fame

page_text: I produce these results by making apertures at the lower part of the
chimney for the admission of an extra quantity of air besides that supplied to
the burner as usual; this air being brought in contact with the flame
produces the combustion of all the parts which are not completely oxygenized.
In the annexed Drawing are represented three forms of chimneys, the 1st
being applicable to a petroleum oil lamp, the 2nd for schist oils, and the 3rd
to oil or gas lamps.
A represents a bead formed on the lower part of the chimney, and B
openings made by grinding or otherwise in the said bead, which openings vary
in number according to the size of the chimney. Experiments have proved
that the air introduced through these openings (which should be below the
flame) will supply a sufficient amount of oxygen for producing the combustion.
of the carbon and hydrogen. In this manner an economy in the consumption
of over twenty per cent. may be obtained, especially with petroleum or schist
oils. Further, these chimneys will not break even when exposed to a
sudden current of air, which is an advantage not possessed by chimneys
hitherto made.
The Invention thus consists in providing lamp chimneys with certain
number of perforations at the lower part for the purposes before mentioned,
the said chimneys being applicable to lamps burning vegetable or mineral
oils or gas.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Clark in the Great Seal Patent Office on the
29th April 1867.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
CLARK, of 53, Chancery Lane, in the County of Middlesex, Engineer and
Patent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Thirty-first day of October, in the year of our Lord
One thousand eight hundred and sixty-six, in the thirtieth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said William Clark, Her special licence that I, the said William
Clark, my executors, administrators, and assigns, or such others as 'I,
the said William Clark, my executors, administrators, and assigns, should
at any time agree with, and no others, from time to time and at all
times thereafter during the term. therein expressed, should and lawfully

page_text: might make, use, exercise, and vend; within the United Kingdom of Great
Britain and Ireland, the Channel Islands, and Isle of Man, an Invention:
for "IMPROVEMENTS IN LAMP GLASSES OR CHIMNEYS," a communication to me
from abroad by Joseph Lallemand and Godefroi Auguste Guillaume Wagener,
Manufacturers, both of 29, Boulevart St. Martin, Paris, upon the con-
dition (amongst others) that I, the said 'William Clark, my executors or
administrators, by an instrument in writing under my, or their, or one of
their hands and seals, should particularly describe and ascertain the nature!
of the said Invention, and in what manner the same was to be performed,
and cause the same to be filed in the Great Seal Patent Office within six
calendar months next and immediately after the date of the said Letters
Patent.
NOW KNOW YE, that I, the said William Clark, do hereby declare.
the nature of the said Invention, and in what manner the same is to be
performed, to be particularly described and ascertained in and by the following
statement, reference being had to the Sheet of Drawings hereunto annexed
and to the letters and figures marked thereon (that is to say) :-
This Invention relates to improvements in chimneys for lamps.of all kinds,
the object being, First, the prevention of smoke in any lamp using a
chimney. Secondly, to produce a better light. Thirdly, to economize the
consumption by maintaining the oil at a nearly equal temperature, especially
petroleum and schist oils. Fourthly, to prevent chimneys from breaking
through the excessive heat of the flame.
I produce these results by making apertures at the lower part of the
chimney for the admission of an extra quantity of air besides that supplied to
the burner as usual; this air being brought in contact with the flame
produces the combustion of all the parts which are not completely oxygenized:
In the annexed Drawing are represented several forms of chimneys,
Figure 1 being applicable to a petroleum oil lamp; Figure 2 for schist oils;
Figure 3 to oil or gas lamps; and Figure 4 for gas lights.
A represents a bead formed on the lower part of the chimney, and B
openings made by grinding or otherwise in the said bead and varying in
number according to the size of the chimney. Experiments have proved that
the air introduced through these openings (which should be below the flame)
will supply a sufficient amount of oxygen for producing the combustion of the
carbon and hydrogen. In this manner an economy in the consumption of
over twenty per cent. may be obtained, especially with petroleum or schist
oils, Further these chimneys will not break even when exposed to a sudden

page_text: current of air which is an advantage not possessed by chimneys hitherto
made.
Having described the nature of this Invention, and the manner of perform-
ing the same, I declare that what I claim as the Invention to be protected by
the herein-before in part recited Letters Patent is, providing lamp chimneys
with a number of perforations at the lower part, the said chimneys being
applicable to lamps burning vegetable or mineral oils or gas as and for the
purposes described.
.. In witness whereof, I, the said William Clark, have hereunto set my
hand and seal, this Twenty-ninth day of April, in the year of our
Lord One thousand eight hundred and sixty-seven.
Witness,
A. M. CLARK.
53, Chancery Lane,
London.
W. CLARK.. (L.S.)