Improvements in the Manufacture of Mantles for Incandescent Gas Lighting.
Year: 1896

page_text: Date of Application, 18th Feb., 1896
Complete Specification Left, 17th Nov., 1896-Accepted, 19th Dec., 1896
PROVI
Improvements in the Manufacture of Mantles for Incandescent
Gas Lighting.
We, WILLIAM MACKEAN, and THE INCANDESCENT GAS LIGHT COMPANY
LIMITED, all of 14 Palmer Street, Westminster in the County of London, do
hereby declare the nature of this invention to be as follows:-
This invention relates to the manufacture of the hoods or mantles used in
incandescent gas lighting. Hitherto, in the manufacture of these hoods or mantles
the oxides of suitable metals have been mixed with some agglutinating material,
and formed into threads by forcing the paste through a die or draw plate, forming
the threads to the shape required and then calcining.
According to another method a suitable fabric is impregnated with solution of
the salts of the metals, dried and burnt leaving a skeleton of the oxides.
According to the present invention the oxide or a mixture of two or more oxides,
either hydrated or anhydrous, or the carbonates of the oxides, or mixtures of both,
are mixed with an ammoniacal salt such as the nitrate, acetate or sulphate,
sufficient water being added to give any desired consistence. Suitable fibres or
fabrics are then impregnated with the mixture and dried and the fibre or fabric
is then burned as in the manufacture of what are known as the "Welsbach
mantles.
Where 1896.
ABEL & IMKAI,
Agents for the Applicants.
Improvements in the Manufacture of Mantles for Incandescent
Gas Lighting.
We, WILLIAM MACKEAN, and THE INCANDESCENT GAS LIGHT COMPANY,
LIMITED, all of 14 Palmer Street, Westminster in the County of London, 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 the manufacture of the hoods or mantles used in
incandescent gas lighting. Hitherto in the manufacture of these hoods or mantles
according to one method the oxides of suitable metals have been mixed with some
agglutinating material, and formed into threads by forcing the paste through a die
or draw plate, forming the threads to the shape required and then calcining.
According to another method a suitable fabric is impregnated with solution of
the salts of the metals, dried and burnt leaving a skeleton of the oxides.
According to the present invention the oxide or a mixture of two or more oxides,
either hydrated or anhydrous, or the carbonates of the oxides, or mixtures of both,

page_text: are mixed with an ammoniacal salt such as the nitrate, acetate or sulphate,
sufficient water being added to give any desired consistence. Suitable fibres or
fabrics are then impregnated with the mixture and dried and the fibre or fabric
is then burned as in the manufacture of what are known as the "Welsbach "
mantles.
As when the hydrated oxides of the rare earths are heated with an ammoniacal
salt such as the nitrate, the ammonia is expelled and a nitrate of the earth or earths
is formed, so in like manner the oxides of carbonates of ytterite earth, as well as
the oxides of carbonates of cerite-earth such as lanthanum, didymium and cerium
may be decomposed and converted into soluble salts. The reaction takes place
when burning out the fabric after impregnating the mantle, leaving a coherent
skeleton of the oxide or oxides employed.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
The herein described manufacture of mantles for incandescent gas lighting by
mixing oxides or carbonates of suitable metals with a solution of an ammoniacal
salt, impregnating a suitable fabric with the mixture, drying the impregnated
fabric and burning the fabric so as to leave the earthy skeleton of oxide.
Dated this 17th day of November 1896.
ABEL & IMRAY,
Agents for the Applicants.