IMPROVE. MENTS IN REPRODUCING PHOTOGRAPHIC AND OTHER PICTURES, ENGRAVINGS. FRINTS, DEVICES, AND DESIGNS ON THE SURFACES OF GLASS, CERAMIC, AND OTHER SUBSTANCES REQUIRING TO BE FIRED. TO FIX THE SAME THEREON
Year: 1860

page_text: LETIERS PATENT to Ferdinand Jean Joubert; de la Ferte; of 36, Porches-
ter Terrace, in the County of Middlesex, for the Invention of "IMPROVE.
MENTS IN REPRODUCING PHOTOGRAPHIC AND OTHER PICTURES, ENGRAVINGS.
FRINTS, DEVICES, AND DESIGNS ON THE SURFACES OF GLASS, CERAMIC, AND OTHER
SUBSTANCES REQUIRING TO BE FIRED. TO FIX THE SAME THEREON."-Partly a
communication from abroad by Henry Garnier, residing at 71, Rue
Notre Dame des Champs, Paris.
Sealed the 11th April 1860, 2nd dated the 20th January 1860.
PROVISIONAL SPECIFICATION left by the said Ferdinand Jean Joubert
de la Ferte at the Office of the Commissioners of Patents, with his
Petition, on the 20th January 1860.
I, FERDINAND JEAN JOUBERT DE LA FERTE, of 36, Porchester Terrace, in the
County of Middlesex, do hereby declare the nature of the Invention for
"IMPROVEMENTS IN REPRODUCING PHOTOGRAPHIC AND OTHER PICTURES, ENGRAVINGS,
PRINTS. DEVICES. AND DESIGNS ON THE SURFACES OF GLASS, CERAMIC, AND OTHER
SUBSTANCES REQUIRING TO BE FIRED, TO FIX THE SAME THEREON," to be as follows:-
This Invention has for its object improvements in reproducing photographic
and other pictures, engravings, prints, devices and designs, on the surfaces
of glass, ceramic, and other substances requiring to be fired to fix the same
[Price 8d.1

page_text: thereon. For these purposes the surface of glass or other substance is
prepared or coated over with a preparation composed of a salt or chromic acid
and saccharine matter, and when dry the prepared surface is placed under the
photographic or other picture, engraving, print. device or design on paper, or
other material capable of transmitting light, and the same is exposed to light
for a time; the surface is then rubbed or coated over with a coloring matter
or matters in the state of powder, the surface is then heated, washed, dried,
and subsequently fired, several colors may be used in succession and the
surface fired again and again.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said Ferdinand Jean Joubert de la Ferte, in the Great Seal
Patent Office on the 20th July 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FERDINAND
JEAN JOUBERT DE LA FERTE, of 36, Porchester Terrace, in the County of
Middlesex, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twentieth day of January, in the year of our Lord
One thousand eight hundred and sixty, in the twenty-third year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said Ferdinand Jean Joubert de la Ferte, Her special licence that
1, the said Ferdinand Jean Joubert de la Ferte, my executors, administrators,
and assigns, or such others as I, the said Ferdinand Jean Joubert de la
-Ferte,-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
REPRODUCING PHOTOGRAPHIC AND OTHER PICTURES, ENGRAVINGS, PRINTS, DEVICES, AND
DESIGNS ON THE SURFACES OF GLASS, CERAMIC AND OTHER SUBSTANCES REQUIRING TO
BE FIRED, TO FIX THE SAME THEREON." partly a communication from abroad by
Henry Garnier, residing at 71, Rue Notre Dame Deschamps, Paris, upon
the condition (amongst others) that I, the said Ferdinand Jean Joubert de la
Ferte, my executors or administrators, by an instrument in writing under my or
their, or one of their hands and seals, should particularly describe and ascer-
tain the nature of the said Invention, and in what manner the same
to be performed, and cause the same to be filed in the Great Seal Patent

page_text: Office within six calendar months next and immediately after the date of the
said Letters Patent.
"
NOW KNOW YE, that I, the said Ferdinand Jean Joubert de la Ferie
do hereby declare the nature of the said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained in and
by the following statement thereof, that is to say:-
1
This Invention has for its object improvements in reproducing photographic
and other pictures, engravings, prints, devices and designs, on the surfaces of
glass, ceramic and other substances requiring to be fired, to fix the same
thereon. For this purpose I proceed in the following way; if glass be the
surface to be ornamented, a piece of crown or flatted or plate glass, being
firstly well cleaned and perfectly free from dust, is taken and held horizontally
and a solution the composition of which is hereafter detailed is poured gently
over so as to cover the whole upper surface equally, it is necessary to do this
rapidly and to avoid the glare of the day light on the solution while it is
being spread, therefore it is, well to select a room rather dark to operate in
The glass is then exposed over a gentle fire or gas stove but protected from
the light of the gas until the solution is perfectly dried; it is then ready
to receive the image to be copied. The next process is this,--a photographic
or other picture on glass or on paper shewing as a positive by transmitted
light is placed in an ordinary photographic pressure printing frame, the face
towards the operator, and the piece of glass prepared with the solution is
carefully placed on the photograph or picture, the solution or prepared side
downwards; the frame is then shut up, fastened, and exposed to the light out
of doors or in a photographic glass room, if perfectly light for a space of time
varying from fifteen to sixty seconds or sometimes much more according to
the state of the daylight. When the glass is removed (with care) the image
ought to be indicated very visibly and sharply in a negative form. The whole
surface of the glass on the image side is then rubbed gently up and down with
a camel hair brush of a large size charged with well divided enamel or vitreous
color of the tint required, and such as is ordinarily prepared and sold for
painting on glass and articles of ceramic ware, until the image has become a
distinct and perfect positive on looking at it by transmitted light. Then some
pure spirits of wine with which it is convenient to mix a few drops of acetic
or nitric acid, (about six minims of Beaufoy's acid to the ounce) is poured on
the surface of the glass very carefully all over and poured off at one corner;
I repeat the same with clean spirits until the film on the glass has been well
soaked; the glass is then dried slowly. When completely dry it is quickly
immersed in clean water, in which it may be convenient to mix a little car-

page_text: organic substances which will retain a sticky surface in ordinary conditions
of the atmosphere; but these substances cannot, I believe, be used so advanta-
geously as honey. I have only alluded to pictures in monochromes, but it is
possible to obtain them in two or more colors by two or more operations one
for each color, for example in case of a bunch of roses to be reproduced, the
first operation will leave out the flower itself and after the first firing and fixing
them by carefully registering the flower on the glass prepared with a fresh
solution and adapting a different appropriate color when fired the second time
the desired effect will be obtained. It is possible to produce pictures in two
or more colors in one firing.
Having thus described the nature of my said Invention and the manner of
performing the same, I would have it understood, that I do not confine myself
to the exact details described but what I claim is, the reproducing photo-
graphic and other pictures, engravings, prints, devices, and designs, on the
surfaces of glass, ceramic and other substances requiring to be fired in order to
fix the same by coating such surfaces with a stickey composition acted on by
light, then printing on the surface in the manner of photographic printing,
thus destroying or changing the stickey composition where the light acts upon
it and consequently causing a suitable coloring matter to adhere to such por-
tions of the surface as remain stickey as herein-before described. I also claim
the use as above described of a composition containing bichromate of ammonia
or other salt of chromic acid and honey or other similar stickey organic sub-
stance; albumen being also added as herein-before stated.
In witness whereof, I, the said Ferdinand Jean Joubert de la Ferte, have
hereunto set my hand and scal, this Nineteenth day of July, in the
year of our Lord One thousand eight hundred and sixty.
F. JOUBERT. (L.S.)