improvements in the Manufacture of Incandescing Media for use in Incandescent Gas Lighting.
Year: 1897

page_text: Date of Application, 7th Jan., 1897
Complete Specification Left, 7th Oct., 1897-Accepted, 13th Nov., 1897
PROVISIONAL SPECIFICATION.
improvements in the Manufacture of Incandescing Media for use in
Incandescent Gas Lighting.
I, RUDOLF LANGHANS, of 12", Elisabeth Strasse, Berlin, in the German Empire,
Electrician, do hereby declare the nature of this invention to be as follows:-
This invention relates to the manufacture of incandescing bodies in which
vanadiniferous thoria is made use of as an illuminant.
In a specification accompanying a prior application, I have shewn that the
light-emitting capacity of zirconia is capable of being notably increased and the
character of the light improved by the agency of a very small admixture of
vanadiniferous pentoxide (V, 0); the presence of this agent having also the
effect of increasing the strength of the incandescing body. Further experiments
have proved that the vanadiniferous pentoxide behaves in a similar manner when
combined with thoria, so that the former can likewise be made use of for
improving thoria-incandescing bodies as regards both their light-emitting power
and their strength.
The proportion of vanadiniferous pentoxide required for obtaining the effects
above referred to is from to 2 per cent., and it should be mixed as intimately
as possible with the thoria.
When exposed to the Bunsen flame, a freshly prepared mixture of thoria with
a small proportion of vanadiniferous pentoxide such as before specified glows at
first with a disagreably yellowish tint which subsequently changes to a greyish
tinted light and then into a brilliant white light of great power.
In ne manufacture of the improved_thoria-incandescing media, I proceed in
any of the known ways. For instance, I may impregnate thoria with an aqueous
solution of pentoxide of vanadine or of a vanadyle salt. As is known, vanadyle
salts are obtained by dissolving vanadine pentoxide in an acid and properly
heating, vanadine pentoxide being left behind. The bodies to be used for
incandescent lighting are formed from the paste or mass thus produced and are
calcined until they radiate light. Or I may first form the body from thoria and
Or I may
then impregnate the same with the said watery vanadiniferous solution.
dissolve a thorium salt, for instance, thorium nitrate, in an aqueous solution of
pentoxide of vanadine or of a vanadyle salt and impregnate a fabric or other
fibrous foundation with the liquor, the impregnated fabric or body being then
dried and finally calcined. Or I may evaporate the vanadiniferous thoria solution
to dryness, form the residue into the shape desired and calcine the body thus
obtained. Or I may produce a thoria body by means of electrolysis as described
in the Specification to my Letters Patent bearing date 22nd November, 1893,
No. 22,396, impregnate the same with an aqueous solution of pentoxide of
vanadine or of a vanadyle salt, and, after drying the impregnated body, calcine it.
The watery solution of pentoxide of vanadine is employed when it is desired

page_text: to apply a minimum proportion of pentoxide, whilst the aqueous solution of a
vanadyle salt is preferable in cases where larger proportions are adopted.
Dated this 7th day of January 1897.
Improvements in the Manufacture of Incandescing Media for use in
Incandescent Gas-lighting.
I, RUDOLF LANGHANS, of 12, Elisabeth Strasse, Berlin, in the German Empire,
Electrician, 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 incandescing bodies in which
vanadiniferous thoria is made use of as an illuminant.
In a specification accompanying a prior application, I have shown that the
light-emitting capacity of zirconia is capable of being notably increased and the
character of the light improved by the agency of a very small admixture of
vanadiniferous pentoxide (V2 05); the presence of this agent having also the
effect of increasing the strength of the incandescing body. Further experiments
have proved that the vanadiniferous pentoxide behaves in a similar manner when
combined with thoria, so that the former can likewise be made use of for
improving thoria-incandescing bodies as regards both their light-emitting power
and their strength.
The proportion of vanadiniferous pentoxide required for obtaining the effects
above referred to is from 1 to 2 per cent., and it should be mixed as intimately
as possible with the thoria.
When exposed to the Bunsen flame, a freshly prepared mixture of thoria with
a small proportion of vanadiniferous pentoxide such as before specified glows at
first with a disagreeably yellowish tint which subsequently changes to a greyish
tinted light and then into a brilliant white light of great power.
In the manufacture of the improved thoria-incandescing media, I proceed in
any of the known ways. For instance, I may impregnate thoria with an aqueous
solution of pentoxide of vanadine or of a vanadyle salt. As is known, vanadyle
salts are obtained by dissolving vanadine pentoxide in an acid and properly
heating, vanadine pentoxide being left behind. The bodies to be used for
incandescent lighting are formed from the paste or mass thus produced and are
calcined until they radiate light. Or I may first form the body from thoria and
then impregnate the same with the said watery vanadiniferous solution. Or I may
dissolve a thorium salt, for instance, thorium nitrate, in an aqueous solution of
pentoxide of vanadine or of a vanadyle salt and impregnate a fabric or other
fibrous foundation with the liquor, the impregnated fabric or body being then
dried and finally calcined. Or I may evaporate the vanadiniferous thoria solution
to dryness, form the residue into the shape desired and calcine the body thus
obtained. Or I may produce a thoria body by means of electrolysis as described
in the Specification to my "Letters l'atent bearing date 22nd November, 1893,
No. 22,396, impregnate the same with an aqueous solution of pentoxide of
- vanadine or of a vanadyle salt, and, after drying the impregnated body, calcine it.
The watery solution of pentoxide of vanadine is employed when it is desired

page_text: to apply a minimum proportion of pentoxide, whilst the aqueous solution of a
vanadyle salt is preferable in cases where larger proportions are adopted.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I claim : —
1. The manufacture of incandescing media for
use in gas-lighting
substantially as herein described and in which vanadiniferous thoria is employed.
2. In the manufacture of incandescing media consists essentially of thoria,
the employment of from 5 per cent. to 2 per cent. of pentoxide of vanadine,
substantially as and for the purposes herein set forth.
3. In the production of vanadiniferous thoria bodies for use as incandescing
media, the employment of thoria dissolved in an aqueous solution of pentoxide of
vanadine or of a vanadyle salt, substantially as herein described.
4. In the production of vanadiniferous thoria bodies for use as incandescing
media, impregnating thoria with an aqueous solution of pentoxide of vanadine or
of a vanadyle salt, forming the incandescing bodies from the resultant paste,
drying, and ultimately calcining the same in the Bunsen flame, substantially as
herein described.