IMPROVEMENTS IN," THE PREPARATION OF GLASS FOR ORNAMENTAL PURPOSES."
Year: 1855

page_text: LETTERS PATENT to George Burridge, of Great Portland Street, in the
County of Middlesex, Architect, for the Invention of "IMPROVEMENTS IN,"
THE PREPARATION OF GLASS FOR ORNAMENTAL PURPOSES."
"
PROVISIONAL SPECIFICATION. left by the said George Burridge at
the Office of the Commissioners, of Patents, with his Petition, on the
5th November 1855.
I, GEORGE BURRIDGE, of Great Portland Street, in the County of Middle-
sex, Architect, do hereby declare the nature of the said Invention for
'IMPROVEMENTS IN THE PREPARATION OF GLASS FOR ORNAMENTAL PURPOSES" to
be as follows:
T
This Invention consists in a new mode of preparing colored glass, so that
the after processes of ornamenting can be accomplished in a more speedy
and effective mode than at present. Much of the glass used for orna-
menting purposes at present is colored on one side only, altho' from its
transparency this is not easily distinguished, and where different effects of
coloring are required, much labour is expended in obtaining them. "By my
process I propose to color the glass on both sides, each side being of a different
color; or I employ two sheets of glass of different color, such sheets being
rolled, pressed, or otherwise placed together, so as to form one sheet:

page_text: By means of glass prepared in this way devices of any kind may be formed
on the sides of the glass, the coloring being removed from that portion of the
glass where such devices are made, so, that the color on the other side will
shew through, whilst the portions not having the device and retaining the two
colors will present a fine tint of a compound description. Where two colors
are used in this way the effect of 4 can be obtained; as, for instance, supposing
red and green to be the colors on the. glass, the effects of each of those colors
a compound color, by a device on both sides at the same place a perfect
transparency or an opaque effect will be obtained.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said George Burridge in the Great Seal Patent Office on the
5th May 1856.
די
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, GEORGE
BURRIDGE, of Great Portland Street, in the County of Middlesex, Architect,
send greeting..
2
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fifth day of November, in the year of our Lord
One thousand eight hundred and fifty-five, in the nineteenth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said George Burridge, Her special license that I, the said George Burridge, my
executors, administrators, and assigns, or such others as I, the said George
Burridge, my executors, administrators, or assigns, should at any time agree
with, and no others, from time to time and at all times thereafter during the
term, therein expressed, should and lawfully might make,, use, exercise, and
vend, within the United Kingdom of Great Britain and Ireland, the Channel.
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN THE PREPA
BATION OF GLASS FOR, ORNAMENTAL, PURPOSES," upon the.. condition. (amongst
others) that I, the said George, Burridge, by an instrument in writing,
under my hand and seal, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to be per-
formed, and cause the same to be filed in the Great Seal Patent Office within.
six calendar months next and immediately after the date of the said Letters,
Patent.
.
NOW KNOW YE, that I, the said George Burridge, do hereby declare, the
nature of my said. Invention, and in what manner the same is to be per-
.

page_text: formed, to be particularly described and ascertained in and by the following
statement, reference being had to the accompanying Drawings, and to the
letters and figures marked thereon, that is to say:-
:
My said Invention consists of a new mode of preparing colored glass, so that
the after processes of ornamenting can be accomplished in a more speedy and.
effective manner than at present. Much of the glass now employed for,
ornamenting purposes is colored on one side only, although from its trans-.
parency this is not easily distinguished, and where different effects of coloring
are required, much labor is expended in obtaining them. By my process I
propose to color the glass on both sides, each side being of. a different color;
or I employ two sheets of glass of different colors, such sheets being rolled
or pressed together, or otherwise united, so as to form one sheet.
By means of glass prepared in this way devices of any kind may be formed.
on the sides of the glass, the coloring being removed from that portion of the.
glass where such devices are made, so that the color on the other side will
shew through, whilst the portions retaining the two colors will present a fine>
tint of a compound or dark description. Where two colors are used in this
way the effect of four colors can be obtained; as, for example, supposing blue
and yellow to be the colors on the two sides of the glass, the effects of each of:
those colors may either be obtained separately, or combined into a compound:
color, giving an opaque effect, by having a device on both sides of the glass at.
the same place, and a perfect transparency or white light may be obtained by+
removing both colors on both sides of the glass at the same place.
.<)
And in order that, my said Invention may be fully understood, I shall now.
proceed more particularly to describe the same, and for that purpose I shall:
refer to the several Figures on the Sheet of Drawings hereunto annexed.
Figures 1-and 2 represent the two opposite sides or surfaces of a plate of
glass in the process of ornamentation, and having a blue stain or flash on one.
side and a yellow stain or flash on the other; any colors, however, may of course:
be used, according to taste, and the colors in. the design or pattern. I take a
piece of this glass, so prepared, and after having thoroughly. cleaned it I:
place the design to be produced underneath it, having, say, the blue side,
uppermost; I then trace in Brunswick black with a camel's hair' pencil over.
those parts of the design shewn in or colored blue, and also over those parts
where the blue and yellow colors are shewn combined. After allowing the
glass to stand for about twenty-four hours to admit of the coating becoming
hardened, I pour on a sufficient. quantity of fluoric acid to remove all the:
remaining blue flash which has not been covered with the protective coating,
herein-before referred to; I then wash off. the acid and protective coating..

page_text: and repeat the same process on the yellow side, that is, all the yellow parts
in the design, and those parts where a combination of the two colors is
required, are covered with the protective coating, of Brunswick black, and I
remove the exposed parts of the yellow flash by fluoric acid, as herein-before
described. It will thus be obvious. that the blue and yellow portions of the
design will remain intact, as also those portions where the two combined colors,
are shewn, whilst those places on. the glass from, which both colors have,
been etched away or removed by the facid will remain perfectly transparent
and colorless. The plate when completed and held up to the light will then
present a correct. representation of the design,i as shewn at, Figure 3. The
blues are those parts where a corresponding piece of yellow has been removed,
from the back of the glass at that part, and the yellows are those parts,
where the blue has been removed. The white is where both colors have been
etched away, and the dark. or opaque 'parts are those where both colors are,
left, and are thus allowed to combine, producing, the dark or apparently
opaque effects, shewn in black or dark color, on the Diagram, Figure 3.
In more elaborate designs, more combined colors and graduated tints may
be produced by having two or more layers or strata of colors; and employing
more bitings in with the acid to different depths, according to the colors;
required to be shewn. Opaque, coats of enamel may obviously be applied to
one or both sides of the sheet of glass to be ornamented, and may be made,
to produce pleasing effects when used in combination with the transparent
flashes or stains, herein-before referred to.
I may here, observe that I do not confine myself to any particular mode of
applying the different colors, flashes, or stains so long as the main feature
of my Invention be retained, which is,. the ornamenting of sheets or surfaces of
glass by applying one or more transparent. colors or flashes of the same or
different tints to one or both sides of the glass to be ornamented, in combina-.
tion or not with one or more coats of opaque or enamel color, also applied,
to one or both sides of the glass, and the production of the required design, by
removing (by acid either in a liquid or gaseous state, or by grinding, cutting,
etching, engraving, or by any other suitable means,) certain portions of the
colors on each side of the glass, as herein-before described.
:
Having now described and particularly ascertained the nature of the said
Invention, and the manner in which the same is or may be used or carried into
effect, I would observe, in conclusion, that I do not confine or restrict myself to
the precise details or arrangements which I have had occasion to describe or
refer to, as many variations may be made therefrom without deviating from
the principles or main features of my said Invention; but what I consider to

page_text: be novel and original, and therefore claim as the Invention secured to me by
the herein-before in part recited Letters Patent, is, the system or mode herein-
before described of ornamenting all kinds of glass, by applying transparent
flashes or stains or opaque enamels on one or both sides of the glass, and
subsequently removing portions of the transparent flashes or stains or opaque
enamels by acid or other suitable means.
In witness whereof, I, the said George Burridge, have hereunto set
my hand and seal, the Third day of May, One thousand eight
hundred and fifty-six.
GEORGE BURRIDGE. (L.S.).
GEORGE BURRIDGE. (L.S.).