Improvements in and relating to Incandescent Gas Lighting.
Year: 1894

page_text: Date of Application, 13th Apr., 1894-Accepted, 9th June, 1894
COMPLETE SPECIFICATION.
Improvements in and relating to Incandescent Gas Lighting.
We MAX BERNSTEIN, Proprietor of the Firm of Johann Friedrich Wallmann
& Co., Merchants and ALBERT SILBERMANN, Manufacturer of Metallic Wares,
both of 74 Blumen Strasse Berlin Germany, do hereby declare the nature of our
invention and in what manner the same is performed to be particularly described
and ascertained in and by the following statement :-
The present invention relates to improvements in incandescent gas lighting, and
more particularly to the construction of the illuminating incandescent body.
According to our invention we form the luminous body of a series of conical
plates of various diameters built up one on the other, the undermost being of the
smallest diameter, the said conical plates being full or perforated round and near
the apex and having a porous outer edge as hereinafter more particularly
described.
Luminous bodies constructed according to the present invention have a greater
illuminating surface and are made of material having great radiating power.
And in order to make the present invention more easily intelligible reference is
had to the accompanying drawings in which similar letters denote similar parts
throughout the several views:-
Fig. 1 being a vertical section through the device, and Fig. 2 a plan. of the .
same.
Within the Bunsen burner A is arranged a cross piece a, on which a rod b is
supported in any suitable manner.
At about the upper end of the burner is a flange e on the said rod b, which
supports the conically shaped plates d d, by means of their lower perforated bosses,
the outer edges of the said plates d d are bevelled off to the same angle in all the
plates, and the latter are advantageously of such diameter, that when arranged one
over the other, the bevelled edges shall all lie in one and the same straight line.
Thus lines drawn from the edge of the upper plate and passing along the bevelled
edges of the plates below, would all meet if prolonged, at a point within the
burner A. The body of the said plates may be perforated as at for plain, but the
edges are made porous all round as shown at g g. The plates are superposed in
the manner shown, the lowest having the smallest diameter and the uppermost the
largest, the intermediate plates gradually increasing in diameter. The body of the
plate may be conical or curved and the upper edges plain or notched.
The plates are made of pure chamotte (a mixture of refractory clay with broken
saggers) or kaolin, or of a mixture of the same, with an addition of graphite, water-
glass or the like, and can be produced either by a cold or hot process. The porous
rim round the edge of the plates is produced by the addition of sawdust, or cork
meal, during the manufacture of the plates in the well known manner.
The finished plates are dipped in an illuminating liquid such as magnesium
oxide (MgO) and then arranged on the rod 6 in the manner previously described,
so that they can be easily removed, in case they need to be replenished with the
illuminating liquid, or to be replaced by new plates.
By means of this device the combustion gases coming from the burner are forced
to take their way along the edges of the plates, in the form of a cone having an
intensely luminous centre or core.

page_text: Having now particularly described and ascertained the nature of our said
invention and in what manner the same is performed we declare that what we
claim is :-
A luminous body for incandescent lamps, consisting of a series of superposed
plates dd, impregnated with an illuminating liquid, said plates being arranged
above the burner on a rod such as 6, having varying diameters gradually increasing
from the bottom plate and having bevelled edges, arranged in a line with each
other so that the whole series of plates forms a cone in the manner and for the
purpose substantially as described.
Dated this 13th day of April 1894.
W. P. THOMPSON & BOULT,
Agents for the Applicants.