An Improved Chemical Composition Intended for the Manufacture of Mantles or Blocks for use in Electric Arc Lamps.
Year: 1898

page_text: Date of Application, 28th May, 1898
Complete Specification Left, 28th Feb., 1899-Accepted, 1st Apr.,
1899
An Improved Chemical Composition Intended for the Manufacture of
Mantles or Blocks for use in Electric Arc Lamps.
I, PAUL MERSCH, of No. 4, Avenue Hoche, Paris, in the Republic of France,
do hereby declare the nature of this invention to be as follows:-
This invention relates to a chemical composition intended for the manufacture
of mantles applicable to electric are lamps for the purpose of increasing their
illuminating power.
The mantle form is not, however, the only form in which this composition is
capable of application to electric arc lamps, as blocks may be formed with the
paste which are intended to be interposed between the points of the carbons, or
tubes for surrounding the carbons may be formed, and so forth. _ One arrange-
ment which gives excellent results is hereinafter described.
A ring formed of this composition surrounds the upper carbon and forms a
reflector; a small opaline globe is attached to this ring and the whole is main-
tained by a support. The effect of such a mantle is to increase by 30 per cent.
the luminous intensity of the arc; it economises about one third in the consump-
tion of current and prolongs the life of the carbons to the extent of 50 per cent.
The substance of which the mantle is formed is absolutely incombustible and
is rendered incandescent without volatilisation and without deterioration at the
high or low temperatures of the arc.
I prepare the composition of which these mantles or blades are formed in the
following manner:
I mix in a dry state and very intimately, until the whole is of one uniform
colour:
4 parts of plastic clay
3 parts of oxide of aluminium
part of kaolin
I then add water by degrees until the substance assumes the consistency of a
paste.
The clay serves to combine with the water and impart consistency to the sub-
stance.
The oxide of aluminium which resists high temperatures assists the clay to
support sudden cooling without breaking or cracking; in addition to this it
whitens the paste.
The kaolin by its brilliancy after baking whitens the paste, and, together
with the oxide of aluminium, increases the illuminating power.
It is thus absolutely indispensable, if the desired result is to be obtained, to
mix these three substances in a thoroughly intimate and homogeneous manner
and to submit them after being moulded to a prolonged baking.
Taken separately these substances would give no result. According to my
invention however I combine the three substances, specially prepared in the
017

page_text: Taken separately, these substances would not yield any useful result. Accord-
ing to my invention however I combine the three substances, especially prepared
in the manner hereinbefore described with the object of adapting them for
obtaining the desired result.
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:-
-
An improved chemical composition consisting of plastic clay, aluminium oxide
and kaolin prepared in the manner specified and serving for the manufacture of
mantles, sleeves, or blocks adapted to be arranged around the voltaic arc for the
purpose of increasing the illuminating power by reason of the heat of the arc com-
municated to the said substances which render them partly incandescent.
Dated this 28th dox of Fohm 1900
HASELTINE, LAKE & Co.,
45, Southampton Buildings, London, W.C.,
Agents for the Applicant.