An Improvement in Incandescent Gas Burners.
Year: 1893

page_text: Reprinted
as amended in accordance with the decision of the Comptroller General,
dated the 12th day of July 1899.
Date of Application, 3rd Jan., 1893
Complete Specification Left, 3rd Nov., 1893-Accepted, 3rd Feb., 1894
[Communicated from abroad by JULIUS MOELLER, at present of Grand Hotel,
Terminus Gare St. Lazare, Paris, France.]
An Improvement in Incandescent Gas Burners.
I, OLIVER IMRAY, of No. 28, Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, do hereby declare the nature of this
invention to be as follows: —
:
This invention relates to incandescent gas burners of the kind described in the
Specification No. 15286 of 1885.
Burners as therein described consist of a network hood of metallic oxide heated
to incandescence by the flame of a Bunsen gas burner over which the hood is
suspended. It has been found that the incandescent oxide of the metal thorium,
when in a pure state, gives comparatively little light, but that when it has added
to it a very small proportion, not exceeding one or two per cent., of the oxides of
certain others of the rare metals such as uranium; cerium, terbium, neodymium
samarium, and prazeodymium it has a very high illuminating power.
In order to produce a hood of this kind, according to this invention, nitrate of
thorium in the purest possible condition is dissolved in water; to this is added
1-to 2 per cent. of solution of nitrate of one of the other metals above mentioned,
preferably uranium. A network hood of vegetable textile material is soaked in this
solution, dried and then subjected to heat over a Bunsen burner, whereby the
vegetable fibres are burned away and the metallic nitrates are converted into oxides,
forming a network skeleton hood of the mixed oxides, which when it is heated
to incandescence over a Bunsen burner, gives out a very brilliant light.
Dated this 3rd day of January 1893.
ABEL & IMRAY,
Agents for the Applicant.
COMPLETE SPECIFICATION (AMENDED).
An Improvement in Incandescent Gas Burners.
I OLIVER IMRAY, of No. 28, Southampton Buildings, Chancery Lane, in the
County of London, Chartered Patent Agent, 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 incandescent gas burners of the kind described in the
Specification No. 15286 of 1885.
Burners as therein described consist of a network hood of metallic oxide heated
to incandescence by the flame of a Bunsen gas burner over which the hood is

page_text: suspended. It has been found that the incandescent oxide of the metal thorium,
when in a pure state, gives comparatively little light, but that when it has added
to it a very small proportion, generally not exceeding one or two per cent., of the
oxides of certain others of the rare metals such as namely uranium, cerium,
terbium, neodymium, samarium or prazeodymium yttrium-and-lanthanum, it has
a very high illuminating power.
In order to produce a hood of this kind, according to this invention, nitrate of
thorium, in the purest possible condition, is dissolved in water; to this is added
1 to 2 per cent. of solution of nitrate of one of the other metals above mentioned,
preferably uranium.
A network hood of vegetable textile material is soaked in this solution, dried and
then subjected to heat over a Bunsen burner, whereby the vegetable fibres are
burned away and the metallic nitrates are converted into oxides, forming a network
skeleton hood of the mixed oxides, which, when it is heated to incandescence over
a Bunsen burner, gives out a very brilliant light.
Having now particularly described and ascertained the nature of this invention
and in what manner the same is to be performed, declare that what I
claim is :-
...
A hood for an incandescent gas burner consisting of pure oxide of thorium with
aismáll proportion of oxide of one of the rare metals herein mentioned, prepared
as described.
f.