Window Prism Lights having Prisms on One Side with Prisms at an Angle thereto on Either Side.
Year: 1897

page_text: Date of Application, 13th July, 1897- Accepted, 28th Aug., 1897
COMPLETE SPECIFICATION.
Window Prism Lights having Prisms on One Side with Prisms at
an Angle thereto on Either Side.
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 my 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 window lights or the like, and has for its object to provide
a new and improved window light for diffusing light throughout a room. My
invention is illustrated in the accompanying drawings, wherein
Figure 1 is a view of a section of ordinary prismatic glass modified so as to
embody my invention.
Figure 2 is a section on line 2-2 of Figure 1.
Figure 3 is a section of ordinary prismatic glass embodying my invention.
Figure 4 is a section on line 4-4 of Figure 3.
Figure 5 shows a modified form of my device.
Like letters refer to like parts throughout the several figures.
The object of my present invention is to provide a window glass, which in
addition to projecting the light straight forward will throw it toward either side
of the window, thereby producing a greater diffusion of the light than can be
obtained by the use of the ordinary prismauc glass.
In Figure 1 and 2 I have shown a section A of prismatic glass provided with the
projecting ribs or prisms B. The surfaces of each of these prisms are broken up
into a series of small ribs or prisms C at an angle to the ribs or prisms B. The
angular relation of these two sets of prisms will of course depend upon the
conditions to be met, and may be varied at will.
In Figures 3 and 4 I have shown the ordinary section of prismatic glass A,
provided on one surface with the projecting prisms B, the other surfaces being
provided with a series of projecting ribs 1) at an angle to the prisms B. The
diffusion of the light will of course be changed by changing the angular relation
of these two sets of prisms. When the light falls upon the glass formed as shown
in these figures, it is changed in direction by the two sets of projecting ribs or
prisms. The light is acted upon differently by these two sets of prisms and upon
leaving the glass is projected towards different parts of the room.
In Figure 5 I have shown a plate of glass, cne surface of which is provided with
a series of hexagonal prisms.
I have not endeavoured to show all the forms of my device, as it is of course
evident that other forms than those herein shown may be used to produce the same
result. I therefore do not wish to be limited to the construction shown.
The device to which my invention is applied is called in the trade a
Light" and such lights are intended to be made up into prism plates to fill the
window or opening.
"Prism

page_text: A prism light of course consists of a substantially flat body of glass, so that such
prism lights can be made up into the prism window plate.
Having now particularly described and ascertained the nature of the said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is
A prism light having on one side a set of prisms systemmatically arranged to
produce an increased illuminating effect and a second set of prisms systemmatically
arranged to produce an increased illuminating effect and inclined to the other set
of prisms substantially as shown and for the purpose specified.
Dated this 13th day of July 1897.
For the Applicant,
W. LLOYD WISE,
46 Lincoln's Inn Fields, London, W.C.,
Chartered Patent Agent.