IMPROVEMENTS IN PRINTING ON AND ORNAMENTING TINNED OR OTHER METALLIC PLATES
Year: 1875

page_text: LETTERS PATENT to Peter Jensen, of 89, Chancery Lane, in the
County of Middlesex, for the Invention of “ IMPROVEMENTS IN PRINTING
ON AND ORNAMENTING TINNED OR OTHER METALLIC PLATES."-A communi-
cation from abroad by the Hamburg-American Sewing Machine
Company, late Pollack, Schmidt, and Company, Hamburg.
Sealed the 19th March 1875, and dated the 2nd January 1875.
PROVISIONAL SPECIFICATION left by the said Peter Jensen at the
Office of the Commissioners of Patents, with his Petition, on the
2nd January 1875.
I, PETER JENSEN, of 89, Chancery Lane, in the County of Middlesex, .
do hereby declare the nature of the said Invention for "IMPROVEMENTS
IN PRINTING ON AND ORNAMENTING TINNED OR OTHER METALLIC PLATES,” (a com-
munication to me from abroad. by the Hamburg-American Sewing
Machine Company, late Pollack, Schmidt, and Company, Hamburg,) to
be as follows:-
The object of this Invention is to produce impressions, ornamental or
otherwise, on tinned or other metallic plates, in a cheap, expeditious, and
all as hoseofter described.

page_text: According to this Invention the desired printing, writing, design, or
drawing is first put on the stone according to the ordinary lithographic
process. It is then by means of strong ink printed off on to paper of
the size of the tin plate, said paper having previously been prepared with
paste, gum, and glycerin. The ink is made of the finest lampblack and
of copal varnish with dryers. The paper is then immediately put on to
a machine adjoining, where a tin plate is ready for it; paper and tin
plate are then passed together through the rollers of the machine, and
the paper then taken off the plate by nieans of a sponge and water.
The desired design will be found to be on the plate. The paper is
used again. When a sufficient number of plates have thus been printed on
they are put into a large iron stove of a temperature of about 70 degrees
Reaumur. After remaining in the oven over night the plates are taken
out. They are then painted over with a solution, consisting of copal lac,
varnish, oil of turpentine, and alkannin, which latter is a coloring
substance from the anchusa tinctoria. The plates are then placed into
a shelf stove heated to about 110 degrees Reaumur. After remaining
therein about twelve hours the plates are ready, having obtained the
desired impressions fixed thereon in a lasting manner.
By the employment of the alkannin a silver white, brass color, gold ·¦
color, or pinchbeck color lustre is obtained, all according to the degree
of heat to which the stove is heated.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Peter Jensen in the Great Seal Patent Office on
the 11th June 1875.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, PETER
JENSEN, of 89, Chancery Lane, in the County of Middlesex, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Second day of January, in the year of
our Lord One thousand eight hundred and seventy-five, in the thirty-
eighth year of Her reign, did, for Herself, Hor heirs and successors, give
and grant unto me, the said Peter Jensen, Her special licence that
I, the said Peter Jensen, my executors, administrators, and assigns,

page_text: or such others as I, the said Peter Jensen, my executors, admini-
strators, and 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
5 within the United Kingdom of Great Britain and Ireland, the Channel
Islands, and Isle of Man, an Invention for "IMPROVEMENTS IN PRINTING
ON AND ORNAMENTING TINNED OR OTHER METALLIC PLATES," a communication
to me from abroad by the Hamburg-American Sewing Machine Com-
pany, late Pollack, Schmidt, and Company, Hamburg, upon the condition
0 (amongst others) that I, the said Peter Jensen, my executors or admi-
nistrators, by an instrument in writing, under my, or their, or one of
their hands and seals, should particularly describe and ascertain the
nature of the said Invention, and in what manner the same was to
be performed, and cause the same to be filed in the Great Seal Patent
5 Office within six calendar months next and immediately after the date
of the said Letters Patent.
M
NOW KNOW YE, that I, the said Peter Jensen, 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
O the following statement thereof, that is to say :—
The object of this Invention is to produce impressions, ornamental or
otherwise, on tinned or other metallic plates in a chcap, expeditious, and
lasting manner, all as herein described.
According to this Invention the desired printing, writing, design, or
5 drawing is first put on the stone according to the ordinary lithographic
process. It is then by means of strong ink printed off on to paper of
the size of the tin plate, said paper having previously been prepared
with paste, gum, and glycerin. Instead of using the lithographic process
the required design may be printed on to the paper by any other process
> of printing with ink. The paper accommodating itself to irregularities
of surface the clearness of the pattern is not affected by blisters or other
imperfections of the plate. The tinned or other metal plate may receive
an ordinary grounding color before being printed on. A suitable ink for
the purpose of this Invention may be made of the finest lampblack and
of copal varnish, and with or without dryers. The paper is then imme-
diately, or before the ink has had time to dry, put on to a machine
adjoining, where a tin plate is ready for it. Paper and tin plate are

page_text: As an
then passed together through the rollers of the machine, and the paper
then taken off the plate by means of a sponge and water. The desired
design will then be found to be on the plate. The paper may be used
again. When a sufficient number of plates have thus been printed on
they are put into a large iron stove of a temperature of about 70 degrees
Reaumur (190° Fahrenheit), and after remaining in the oven over night
the plates are taken out. They are then painted over with a solution,
consisting of copal lac, varnish, oil of turpentine, and alkannin, which
latter is a coloring substance from the anchusa tinctoria.
example, one pound of alkannin contains coloring matter for some
purposes for about 85 pounds of solution. The plates are then placed
into a shelf stove heated by direct fire or by steam or otherwise to about
110 degrees Reaumur (280° Fahrenheit). It is very desirable that this
stove be so constructed as to enable plates to be withdrawn and put in
without causing a change of temperature in the stove. After remaining
therein about twelve hours the plates are ready, having obtained the
desired impressions fixed thereon in a permanent or lasting manner.
By the employment of the alkannin a silver white color, brass color,
gold color, or pinchbeck color or lustre is obtained, all according to the
degree of heat to which the stovo is heated. The more alkannin is
employed, and the more heat the plates are exposed to, the deeper will
be the color or lustre.
The plates before being printed on should by preference be cleaned
with pipe clay, whiting, or chalk, or similar substance with water, in
order to remove all greasy substances from the plate. It has also been
found advantageous to pass the plate with the paper on twice through
the rollers, and to damp the paper again before passing them through
the second time.
As a modification of the aforesaid shelf stove it has been found advan-
tageous to place the printed plate on an iron rack or frame formed with
· shelves, and to run such rack into the stove, which thereby is rendered
into a shelf stove. It has also been found that a higher temperature
than 70° R. (190° F.) may be employed for the first baking of the
plates, and that the aforesaid second or shelf stove may be employed for
the said first baking, thus dispensing with a separate stove for that part
of the process.
In order to produce a combination of colors, say for instance for land-

page_text: PETER JENSEN. (L.S.)
Witness: