Improvements in the Globes of Electric Incandescent and similar Lamps, and Lamp Shades or Chimneys.
Year: 1898

page_text: Date of Application, 25th July, 1898-Accepted, 24th Sept., 1898
UUMI LEIE DEMITICATION.
Improvements in the Globes of Electric Incandescent and similar
Lamps, and Lamp Shades or Chimneys.
We, ENGLISH INDUSTRIALS LIMITED and GEORGE EDWARD HEYL DIA, Elec-
trical Engineer, of 55, Market Street, Manchester, 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:―
Our invention refers to the globes of electric incandescent lamps, glass globes
and glass objects in general used in connection with gas, oil, electric or other
lighting apparatus, and consists essentially in moulding the inner surface of the
glass object on the prismatic principle, i.c. with prisms arranged, by preference,
in hexagonal groups over the entire surface and in such a way that no light
can pass through the glass without being refracted.
To make our invention clear we have hereunto annexed a sheet of drawings
illustrative of its application to an electric incandescent lamp, and will now
proceed to describe the same with the various figures of reference marked thereon.
Fig. 1 illustrates a vertical section of a special form of electric incandescent
lamp to which we prefer to apply our invention, and shewing also, in dotted lines,
an ordinary lamp. Fig. 2 is a part transverse section on a larger scale and Fig. 3
a surface view. Fig. 4 is a similar view to Fig. 2 of a modification.
The prisms are arranged in clusters of hexagon pattern to fully cover the
surface of the glass and the glass is made as thin as possible at the junction of the
several hexagons.
In practice, we prefer to apply our invention to the form of lamp shewn in
full lines in Fig. 1 in that the prisms are more or less an equal distance from
the medium of light, and may be of an equal size. In other shapes of lamps,
and such as the ordinary type of electric lamp shewn in dotted lines, the sizes
of the hexagons may vary at different points. The angles of the prisms may
also vary according to their relation to the light, .e. the point or tip of each
cluster be centric, or eccentric, with the hexagon outline, and thus shorten the
prisms on one side and lengthen or alter the proportions of the other prisms,
according as the cluster is at the top, middle or bottom of the lamp.
In lieu of forming the prisms with their thinner edge at the exterior of the
hexagon, as in Figs. 1, 2 and 3, they may be formed with their thinner edge
towards each other, as shewn in Fig. 4.
Although we prefer the hexagon pattern, we may arrange the prisms in trian-
gular or other figure capable of lying in close proximity without leaving any
part of the glass uncovered.
Having thus particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that what
we claim is:-
-
1: In electric incandescent lamps, globes and like objects the formation of
the inner surface of the lamp on the prismatic principle, as set forth.

page_text: 2: A globe, lamp or like object of the cross-section shewn in Figs. 1 and 2,
as and for the purposes set forth.
3: A globe, lamp or like object of the cross-section shewn in Fig. 4, as and
for the purposes set forth.
Dated this 23rd day of Tule 1800
ENGLISH INDUSTRIALS LTD.
GEORGE EDWARD HEYL-DIA.
By J. G. Wilson & Co.,
Agents, 55, Market Street, Manchester.