Improvements in Litho and Zinco-graphic Processes.
Year: 1892

page_text: Date of Application, 26th. Jan., 1892.
Complete Specification Left, 25th Oct., 1892-Accepted, 10th Dec., 1892
PROVISIONAL SPECIFICATION.
Improvements in Litho and Zinco-graphic Processes.
I, EMIL KUBISCH of Piazza della Borsa No. 1 Triest Austria Drawer do
hereby declare the nature of this invention to be as follows:-
This invention relates to means by which drawings can be produced on stone or
zinc, and has for its object a method by which tinted drawings can be produced
more directly than formerly, and without employing the expensive photographic
graticular process.
According to my invention, I engrave on a inetal plate, by a suitable machine à
number of parallel lines very close together and another set at right angles to the
other, forming a number of very small squares. I then use this plate as a matrix
and produce therefrom another plate in which the lines stand out from the surface.
From this I cast a sheet of gelatine or other similar substance, having the same
surface as the plate first mentioned.
In applying my invention I first ink over the side of the gelatine having small
squares with suitable ink, then lay it on the stone or zinc and draw upon the back.
The drawing must be made in the reverse direction to that in which it is desired in
the copies. The light and shade in the tinting will vary with the pressure put on,
so that any drawing can be accurately transferred in minute dots giving the
appearance at a little distance of an even surface. Instead of using the gelatine
paper, may simply place a sheet of lithographic transfer paper upon the first
metal plate, after inking the surface of the plate, and draw upon the back of the
paper the design required, which will then appear on the face of the paper,
reversed.
Dated this 25th day of January 1892.
GEO. H. RAYNER,
37, Chancery Lane, London, W.C., Agent for the Applicant.
COMPLETE SPECIFICATION.
Improvements in Litho and Zinco-graphic Processes.
I, EMIL KUBISCH, of Piazza della Borsa No. 1, Triest, Austria, Drawer, 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 :-
This invention relates to improved means for producing drawings on stone or
zinc, whereby such drawings can be produced more directly than formerly and
without employing the expensive photographic graticular process.
The invention consists in the production of peculiar plates with squares, either
by engraving or by etching. According to the first method I engrave on a metal
plate by any suitable machine, a number of parallel lines very close together and
also another set at right angles to the first, thus forming a number of very small
squares between the lines.
I then use this plate as a matrix, and produce therefrom
either by electro deposit or by, stamping in metal, another plate or cliché in which
the engraved lines are in relief upon the surface. From this I then either cast a
sheet of gelatine or other similar substance, or I employ a prepared lithographic
transfer paper which is applied with pressure to the said plate, so that the said
gelatine or paper sheet will have a surface of the same nature as the plate first
mentioned.

page_text: When the plates with squares are produced by deep etching, so that the squares
are formed recessed, the gelatine mass is cast directly upon the etched plate,
so that obtain also in this case a sheet with squares standing out from the
surface.
A matrix formed by electro-deposit or deep etching may also be formed into a
cylinder and serve for stamping or printing gelatine sheets or transfer paper.
The gelatine plates may be produced in different ways, according as I wish to
have hard or soft plates, for instance:
a) From pure gelatine dissolved in a suitable quantity of water, so that it has
the necessary consistency.
4) By adding to a mixture of gelatine and water, glycerine or sugar candy in
order to make the mass more ductile, or
c) From gelatine rendered very sensitive to light ("light" or "lithophany
print) for the purpose of hardening the plates and making them more resisting to
the action of moisture.
In producing impressions by means of my invention I first ink over the side of
the gelatine having the small squares with a suitable ink (preferably lithographic
transfer ink) I then lay it on the stone or zinc and draw upon the back with any
suitable pencil. The light and shade will vary in the tinting with, the pressure put
on, so that any drawing can be accurately transferred in minute dots giving the
appearance at a little distance of an even surface. The drawing may also be
drawn directly upon the transfer paper or gelatine plates with lithographic chalk
or ink, which may then be transferred upon stone zine &c. The latter process is
most suitable for the finest work, as the plates or sheets have not (as all other grain
papers) the irregular grains (chalk grain) but form regular squares, quite similar
to the photographic graticular process.
Having now particularly described and ascertained the nature of this inven
tion and in what manner the same is to be performed, I declare that what I
claim is
1. The use for producing drawings for litho and zincography, of a plate provided
with small squares formed by engraving or etching thereon two sets of parallel
lines at right angles to each other, substantially as described..
2. A matrix, that is to say, a plate provided with deepened squares, produced
from the plate described in Claim 1, by casting or electro deposit or deep
etching.
3. Plates or sheets of gelatine or transfer paper one face of which is formed
with small squares, produced from the matrix referred to in the second claim by
casting or stamping, substantially as described.
4. The application of the sheets referred to in the third claim to the production
of impressions either by inking the same on the side having the squares, and then,
on applying the sheet to the stone or zinc plate, drawing the required design &c.
upon the back of the sheet, or by drawing the said design &c. with lithographic
chalk or ink upon the face of the sheet provided with squares, and then applying
the same with pressure to the stone or zinc plate, substantially as described.
Dated this 25th day of October 1892.
ABEL & IMRAY,
Agents for the Applicant.