Year: 1886

page_text: Date of Application, 29th July, 1886.
Complete Left, 28th Apr., 1887.
Complete Accepted, 10th June, 1887.
I HENRY DEFRIES, of the firm of J. Defries and Sons, of No. 147 Houndsditch
London, in the County of Middlesex, Manufacturer, do hereby declare the nature of
this invention to be as follows :-
My Invention relates to an improved process of manufacturing lenses whereby 1
produce a novel lens of any desired colour, and it consists in so combining a plate of
white, flint or colored glass with the metal forming the body of the lens as to form a
lens in one piece, which if a colored plate be used may not be actually colored
throughout, but nevertheless show a same colour from whatever angle it may be seen.
I obtain my novel lens by first cutting a plate of flint, white, ruby, green or other
colored glass to the diameter of the plane or flat part of the lens required, or somewhat
smaller as hereafter explained.
I then place this cold plate in an apparatus which 1 term a preparer, consisting of
a metal pan or mould having a pivoting or hinged cover plate and revolving handle,
and heat in the furnace, or otherwise, to bring this cold plate to a plastic condition.
I now pass the heated plate from the preparer on to a plug within a mould made
in three sections, top, bottom and body, drop on to the heated plate the fluid
metal which is to form the curved portion of the lens, and press with a plunger ;
the result being that the white flint or colored plate and the metal dropped in
form one solid inseparable piece.
The operation in the mould may be reversed, that is to say, the metal to form the
body may first be dropped in and the heated plate be then pressed thereon.
If desired, the metal dropped in may be pressed so as to form a flange around
the entire circumference of the plate, which is then as it were recessed therein and
of less diameter than the actual lens.
I am aware that lenses have been made by combining a plate of colored glass
with a body of white metal, but the two pieces not having been incorporated, as
by my process, such lenses show a full colored light only when seen from the
front and the plate of colored glass is easily broken.
DL: m
T11006

page_text: I, HENRY DEFRIES of the firm of J. Defries and Sons of No. 147 Houndsditch,
London in the County of Middlesex, Manufacturer 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 an improved process of manufacturing lenses whereby 1
produce a novel lens of any desired colour, and it consists in so combining a plate of
white, or colored glass with the flint glass or' metal forming the body of the lens as to
form a lens in one piece, which, if a colored plate be used may not be actually
colored throughout but nevertheless show a same colour from whatever angle it may
be seen; or the plate and body may be of one colour, for example a green plate upon a
green body or a white plate upon a white body or lens, one of the advantages of
invention being that I dispense with the ordinary grinding and polishing.
my
I will now proceed to describe my improved manufacture by reference to the
accompanying Sheet of drawing upon which :-
Figure 1 shows an apparatus which I term a plate preparer, open.
Figure 2 is the same partly closed, and
Figure 3 a sectional view thereof through line 1-2 Figure 1.
Figure 4 shows part of a mould with plate preparer containing heated plate.
Figure 5 part of mould with heated plate prepared to receive the fluid flint white or
colored glass or metal form body of the lens.
Figure 6 the mould with the lens complete.
Figure 7 shows a lens with plate extending over the entire bottom or flat part of
the lens, and
Figure 8 a lens with plate recessed in body.
I obtain my novel lens by first cutting a plate of white, ruby, green or other
colored glass A, to the diameter of the plane or flat part of the lens required B, or
somewhat smaller (see Figs. 7 and 8).
I then place this Circular cold plate in the preparer C (see Figs. 1, 2 and 3)
consisting of a metal pan or mould having a pivoting or hinged cover plate D, and
revolving handle G, and heat in a furnace, or otherwise, to bring this cold plate to a
plastic condition.
I now carry the preparer C, to the mould (see Fig. 4) and by turning the pivoting
plate D by its lug or projecting piece d pass the heated plate A from the preparer
on to the plug E in the mould F (see Fig. 5) which mould is made in three sections
having handles g (see Fig. 6), drop on to the heated plate the fluid metal which is to
form the part B of the lens, and press with a plunger; the result being that the white
or colored plate A and the metal or fluid flint glass dropped in are welded together
and form one solid inseparable piece A-B.

page_text: The operation in the mould may be reversed, that is to say, the metal to form the
body B may first be dropped into the mould and the heated plate A be then
pressed thereon.
If desired the metal dropped in may be pressed so as to form a flange H around the
entire circumference of the plate A which is then as it were recessed therein as at
Fig. 8 and of less diameter than the greatest diameter of B as at Fig. 7.
I desire it to be understood that I do not limit myself to the use of the apparatus
above described and shown on the accompanying drawing but may use any apparatus
which I may find suitable for my improved manufacture of lenses.
I am aware that lenses have been made by combining a plate of colored glass with a
body of white metal, but the two pieces not having been incorporated, as by my
process, such lenses shew a full colored light only when seen from the front and
the plate of glass is easily broken.
Having now particularly described and ascertained the nature of my said invention
and in what manner the same is to be performed I declare that what I claim is :-
1. In the manufacture of lenses, the combination of a white or of a colored plate of
glass with a white or a colored glass body or lens substantially as hereinbefore
described.
2. The lens hereinbefore described and illustrated upon the accompanying drawing,
as constituting a novel article of manufacture.