Improvements in Mantles for Incandescent Lighting and Heating.
Year: 1888

page_text: Date of Application, 6th Dec., 1888
Complete Specification Left, 6th Sept., 1889-Accepted, 12th Oct., 1889
PROVISIONAL SPECIFICATION.
Improvements in Mantles for Incandescent Lighting and Heating.
I, ROBERT DAVY BOWMAN, of No. 80, Lordship Lane, East Dulwich, in the
County of Surrey, Lighting Engineer, do hereby declare the nature of this invention
to be as follows:-
:―
This invention relates to improvements in substances to be rendered incandescent
for illuminating and heating purposes.
$6
In the preparation of what I term a cone "for illuminating purposes, I thoroughly
saturate any fibrous material with a strong solution of the soluble salts of refractory
materials, such as the chlorides or sulphates of calcium, zirconium, magnesia or other
suitable compounds, and afterwards I coat this material with the oxides of either of
the above compounds, forming the whole into the desired shape, and providing a core
or base composed of common whiting with a saturated solution of magnesium.
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The object of this core is to ensure the " cone or mantle retaining its shape when
heated, and also to provide a means for attaching a suitable device for fixing or
suspending the cone in a position to be rendered incandescent.
Dated this 6th day of December 1888:
PHILLIPS & LEIGH,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Mantles for Incandescent Lighting and Heating.
1, ROBERT DAVY BOWMAN, of No. 80, Lordship Lane, East Dulwich, in the County
of Surrey, Lighting Engineer, 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 improvements in mantles for incandescent lighting
and heating.
In carrying it into effect, I thoroughly saturate any fibrous material with a strong
solution of the soluble salts of refractory materials, such as the chlorides or sulphates
of calcium, zirconium, magnesium, or other suitable compounds. The material is
afterwards coated with the oxides of either of the above compounds and worked up
into the desired shape.
It may be provided with a core of whiting and a saturated solution of magnesium
sulphate or chloride. The core serves to prevent the mantle being warped, but
it is chiefly useful as a means for attaching a suitable suspension device to the
mantle.
In order that my invention, and the means by which the same is to be carried
into practical, effect, may be thoroughly understood, I will now describe them in
detail, referring in so doing to the accompanying drawing which is to be taken as
part of this specification.
Fig. 1 is a sectional side elevation illustrating the construction of a mantle and a
method of suspending it in a flame.
Fig. 2 is a plan of the mantle.
Fig. 3 is an inverted plan of the same.
Fig. 4 is a sectional elevation illustrating the winding of the mantle shewn in
sectional elevation in Fig. 5.

page_text: Referring to Figs. 1 to 3, A is the mantle illustrated as built up by winding a
strip of woven material round a suitable mandril. B is the core and Ċ the suspension
device. I do not confine myself to any particular contour of core.
Referring to Figs. 4, 5, 6, the strip of material is wound round a parallel mandrel.
This is then withdrawn, and the hole filled in with the whiting whilst a split pin
with distended legs is held in the cavity.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what I
claim is :-
1. The improved mantle constructed by winding fibrous material saturated and
PHILLIPS & LEIGH,
No. 22, Southampton Buildings, Chancery Lane, W.C.,
Agents for the Applicant.