Ornamental Prism Lights to be used in making up Prism Plates for Windows.
Year: 1897

page_text: Date of Application, 7th Dec., 1897-Accepted, 12th Mar.. 1898
COMPLETE SPECIFICATION.
Ornamental Prism Lights to be used in making up Prism Plates
for Windows.
I, JOHN MEIGGS EWEN, of No. 1129, The Rookery, Chicago, County of Cook, State
of Illinois, United States of America, Mechanical 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 :-
My invention relates to prism lights and has for its object to provide a new and
improved prism light of which the following is a description, reference being had to
the accompanying drawings, wherein
Figure I is a view of a prism light embodying my invention;
Figure 2 is a view of the back of Figure 1;
Figure 3 is a section on line 3-3, Figure 2;
Figure 4 shows a modified construction.
Figure 5 is a section on line 5-5 of Figure 4;
Like letters refer to like parts throughout the several figures.
As illustrated in Figures 1, 2 and 3, the prism light A is provided on one face with
a series of prisms B systematically arranged so as to produce an increased illuminating
effect. On the back of the prism light I provide a series of prisms C covering only a
portion of the surface of the prism light, the prisms being arranged so as to produce a
design. By this means the design is outlined by the difference in brightness, as it
were, of the several parts of the prism light due to action of the prisms formed on both
sides thereof. It will be seen that by this construction I am enabled to easily provide
the prism light with any desired and suitable design. This design will be seen from
both sides of the window or other aperture in connection with which the prism lights
are used. In Figures 1 to 3 I have shown a simple form of design wherein the prism
light is provided with a complete design. In Figure 4, I have shown a portion of a
design on the prism light, it being necessary to connect a series of prism lights
together in order to complete the design.
I have spoken of the design as formed by prisms on the back of the prism light,
but it is of course evident that the desired result will be produced if the design is
formed in the glass even though the parts of the design might not strictly come
within the terin prisms, for if the design is formed in the glass, the direction of the
rays of light will be changed by the irregularities on the surface of the glass and the
desired result produced.
It will thus be seen that the set of prisms on the back of the prism light modifies
the action of that portion of the prisms on the other side of the light to which they
are opposed, thereby producing a different distribution of light so as to clearly bring
out the design.
I have only attempted to illustrate my invention in a simple manner in order to
make its application clear and its scope will be readily understood from the foregoing
description by those versed in the art. I, therefore, do not wish to be limited by the
construction shown.

page_text: Having now particularly described and ascertained the nature of the said invention,
and in what manner the same is to be performed, I declare that what I claim is :-
A prism light provided on one surface with a series of prisms systematically
arranged to produce an increased illuminating effect and provided on the other surface
with a series of prisons systematically arranged to aid or effect the first mentioned
prisms, the second series arranged to form a design and cover a less area' than the first
mentioned prisms, substantially as shown and described.
Dated this 7th day of December 1897.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.