Prism Plates for Windows.
Year: 1897

page_text: Date of Application, 7th Dec., 1897-Accepted, 12th Mar., 1898
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 1 is a plan view of the prism side of a prism light embodying my inven-
tion;
Figure 2 is a section through the prism light shown in Figure 1 ;
Figure 3 is a section showing a modified construction.
Like letters refer to like parts throughout the several figures.
In forming the ordinary prism lights, the prisms in the middle of the light are
often imperfect, owing to various reasons, as for example the chilling of the small
amount of glass at the outer ends of the prisms before the glass reaches the bottom
of the grooves in the mold. The prism light is also apt to be distorted and warped
and is generally made small to obviate these evils as far as possible. One of the
objects of my invention is to provide a prism light wherein these evils will be obviated
and also to provide an ornamental prism light.
pro-
Referring now to the drawings, the prism light A is provided with the usual
prisms B, which may be of any construction. On the prism face of the light,
vide a suitable design of any description formed of projecting ribs between the
prisms or across the prisms. These ribs may extend to the surface of the outer edge
of the prisms themselves or may project beyond the prisms. I may also work the
design on the back of the prism light by having the part from which the design is
made project from the back of the light as well as from the front of the light, as
shown at D in Figure 3. It is of course evident that designs and constructions of
any suitable description may be formed in this manner and I have not attempted to
set forth the various constructions embodying my invention, as I consider the device
herein shown sufficient for purposes of illustration. It will be seen that by this
construction I provide on the face of the prism light projecting ribs other than the
prisms which form the design and which act to strengthen the prism light, thus
enabling me to produce lights of larger dimensions than it has been possible hereto-
fore. This construction also aids in producing complete and undistorted prisms, as it
provides more surface near the outer edge of the prisms, thus preventing the material
from cooling before it reaches the bottom of the mold.
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 :-
1. A prism light provided on one side with a series of prisms, said prism light
provided with a design formed on the prism side thereof, said design formed by

page_text: projecting ribs running between or across the prisms, and a series of projecting ribs
on the back of the prism light which re-produce the design formed on the prism side
of the prism light.
2. A prism light, comprising a body portion provided on one side with a series of
prisms, a design formned on the prism side of said prism light, said design made from
projecting ribs which project above the grooves between the prisms.
3. A prism light comprising a body portion provided on one side with a series of
prisms, a design formed on the prism side of said prism light by projecting ribs,
which project above the bottom of the grooves between the prisms and an ornamental
design or grid-like figure on the other side of such prism light.
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