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, 22nd 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.]
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 OF PREPARING
NEGATIVES REQUIRED FOR REPRODUCING PHOTOS IN COPPER-PLATE, LITHO-
GRAPHIC OR PRINTING PRESSES, to be as follows:-
THE
66
Heretofore it has been impossible to reproduce photos in printing machines because
of their smooth surface The object of this invention is to give them a suitable
irregular surface by means of specially prepared negatives.
In my patent No. 5595 dated same date for reproducing Photos in Copper plate
Lithographic and printing presses I have already described one method of preparing
the "negatives" viz: by rubbing powdered oxide of zinc or oxide of bismuth over
the surface of specially prepared pigment paper. They can however be prepared in
different ways all leading to the same result of which the following is one.
On a. level surface painted black or white is fastened by means of glue, grains of
wheat rye lentils beans rice barley, sand &c. or any such like material, from which
plate a very reduced photo is taken which represents a more or less irregular surface
called a corn surface" by means of which a negative is obtained.
With this corn negative in conjunction with the half tone a corn negative is
obtained from which the blocks or plates are prepared.
Instead of using the surface covered with grain &c. a design by hand or with the
guillochir machine may be used.
The same result may be obtained of a copper or glass plate ground or roughed by
a sand blast machine inked as for copper plate printing, from which a few good copies
may be taken on vegetable or prepared paper and from which a negative can be taken
by means of which corn negatives from half tone originals can be produced.

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 of 111 Liberty Street New
York U.S.A. and in what manner the same is to he performed to be particularly
described and ascertained in and by the following statement:-
Heretofore it has been impossible to reproduce Photos in printing machines because
of their smooth surfaces. The object of this invention is to give them a suitable
irregular surface by means of specially prepared negatives.
In our patent No. 5595 dated same date for reproducing Photos in Copper-plate,
Lithographic, or printing presses, I have already described one method of preparing
the negatives'viz by rubbing powdered: oxide of zinc or oxide of bismuth over the
surface of specially prepared pigment paper They can however be prepared in
different ways all leading to the same result of which the following is one
On a level surface painted black or white is fastened by means of glue, grains of
wheat, rye, feutils beans rice barley sand or any such like material from which plate
a very reduced photo is taken which represents a more or less irregular surface called
il corn surface by means of which a negative is obtained.
::
With this corn negative in conjunction with the half tone a corn negative is
obtained from which the blocks or plates are prepared.
Instead of using the surface covered with grain &c. a design by hand or with the
guillochir machine may be used.
The same result may be obtained from a copper or glass plate ground or rouglied'
by, a sand blast machine, inked as for copper plate printing from which a few good
copies may be taken on vegetable 'or prepared paper, and from which a negative can
be taken by means of which corn negatives from half tone originals can be produced.
Having now particularly described and ascertained the nature of my said-invention
and in what manner the same is to be performed I declare that what I claim'is:
A new "method" of preparing the negatives required for reproducing photos in
Copper-plate Lithographic or printing presses consisting in fastening 'on a smooth.
levél surface grains of wheat rye, lentils, beans, rice, barley; sand; or other suitable'
material, or a design suitable for the purpose, and from which plate a photo on a very
reduced scale is taken having 'a corn surface by means of which in conjunction with
half tóne originals corn negatives can be produced substantially as hereinbefore
described.
LORENTZ ALBERT GROTH.