A NEW OR IMPROVED PROCESS FOR PREPARING THE NEGATIVES REQUIRED FOR REPRODUCING PHOTOS IN COPPER-PLATE LITHOGRAPHIC OR PRINTING PRESSES
Year: 1886

page_text: Date of Application, 24th. Apr., 1886.
Complete Left, 18th Jan., 1887.
Complete Accepted, 25th Feb., 1887.
[Communicated from abroad by LOUIS COLLARDON, Captain, of 1204, Cordoba, in the
City of Buenos Ayres, Argentine Republic, South America, and ALBRECHT
EDWARD BARTHEL., Gentleman, of 111, Liberty Street, New York, U.S.A.]
Presses.
I, LORENTZ ALBERT GROTH, K.G.V. Civil Engineer and Proprietor of the Patent
Industrial and Financial Agency 30 Finsbury Pavement London E.C. do hereby
declare the nature of said invention for A NEW OR IMPROVED PROCESS FOR PREPARING
THE NEGATIVES REQUIRED FOR REPRODUCING PHOTOS IN COPPER-PLATE LITHOGRAPHIC
OR PRINTING PRESSES" to be as follows :--
This invention is a modification of those already filed by us on the 22nd April 1886
Nos. 5595 and 5596 the object of which is to prepare the necessary negatives for
reproducing photos in Copper-plate lithographic or printing presses.
The operation is as follows
A plate or cylinder of copper or steel coated with asphalt or other thin plastic sub-
stance in conjunction with a corn or irregular surfaced negative (as described in the
former applications) is exposed to the light and developed in the usual way and then
etched by per-chloride of iron, acid, or by means of electricity.
An uncoloured transfer paper, prepared with chalk is then strongly pressed against
the plate or cylinder so that the raised parts are perfectly impressed into the transfer
paper.
The negative of the picture to be reproduced is then pressed against this transfer,
and exposed to the light whereby a copy of the picture with a corn or irregular surface.
is produced as described in our patent 5595 which after being touched up (if necessary)
with lithographic chalk can be transferred either direct to the stone copper or zinc or
a negative may be taken which then can be used as a medium for making the printing
plates in the usual way..

page_text: A New or Improved Process for Preparing the Negatives Required
for Reproducing Photos in Copper-plate, Lithographic, or Printing
Presses.
::
I LORENTZ ALBERT GROTH K.G.V. Civil Engineer and Proprietor of the Patent
Industrial and Financial Agency 30 Finsbury Pavement London E.C. do hereby
declare the nature of said invention for "A NEW OR IMPROVED PROCESS FOR PREPARING
THE NEGATIVES REQUIRED FOR REPRODUCING PHOTOS IN COPPER-PLATE LITHO-
GRAPHIC OR PRINTING PRESSES a communication to me from abroad by Louis
Collardon, Captain of 1204 Cordoba in the City of Buenos Ayres Argentine Republic
South America, and Albrecht Edward Barthel Gentleman of 111 Liberty Street, New
York U.S.A. and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
This invention is a modification of those already filed by us on the 22nd day of
April 1886 Nos. 5595 and 5596, the object of which is to prepare the necessary
negatives for reproducing photos in copper plate lithographic or printing presses.
The operation is as follows:-
A plate or cylinder of copper or siecl coated with asphalt or other thin plastic
substance in conjunction with a corn or irregular surfaced negative (as described in
my former applications) is exposed to the light and developed in the usual way and
then etched by perchloride of iron acid, or by means of electricity.
An uncoloured transfer paper prepared with chalk is then strongly pressed against
the plate or cylinder so that the raised parts are perfectly impressed into the transfer
paper.
By means of a negative pressed against this transfer paper, and exposed to the light,
a copy with a corn or irregular surface is produced as described in our patent 5595
which after being touched up (if necessary) with lithographic chalk can be transferred
direct to the stone or zine, or a negative may be taken which can be used as a medium
for making the plates in the usual way.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed declare that what
I claim is
The preparation of negatives for reproducing photos in Copper-plate Lithographic
or printing presses consisting in preparing plates or cylinders with peculiar corn or
irregular surfaces on which an uncoloured transfer paper prepared with chalk is
pressed, the impressed copy of which in.conjunction with any negative serves for
producing a positive with a corn or irregular surface by means of which the plates
can be produced as described in our former Patents Nos. 5595 and 5596 of 1886.
LORENTZ ALBERT GROTH.