] plate, Lithographic, or Printing Presses.
Year: 1886

page_text: Date of Application, 22nd Apr., 1886
Complete Left, 18th Jan., 1887.
Complete Accepted, 4th Mar., 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.]
plate, Lithographic, or Printing Presses.
1 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 my said invention for "A NEW OR IMPROVED PROCESS FOR
REPRODUCING PHOTOS IN COPPER-PLATE LITHOGRAPHIC OR PRINTING PRESSES to be
as follows:—
"
The object of this invention is to reproduce Photos in Copper plate Lithographic or
printing presses in a better and cheaper manner than heretofore by means of the common
photographic press.
In order to obtain such a result the photos. to be reproduced must be provided with
a surface in relief. For this purpose a specially prepared gypsum mass as also a
specially prepared pigment paper is required from the latter of which a negative is
taken and which can then be used as a medium for producing an irregular surface of
crooked lines and figures from the half tones.
The gypsum mass is composed of 1 to 6 per cent chalk and 50 per cent water to
each 100 parts gypsum the latter together with the chalk being finely powdered and
well worked with the water to obtain an homogenous mass which is then pressed into
plates of suitable size having a polished surface when dried.
The pigment paper is prepared as follows:
Common black pigment paper is placed in a bath composed of 4% Bichromate of
potash to 100% water for from 1 to 5 minutes, as required, and then dried in a
temperature of 60° to 70° Celcius. The paper is then exposed to the day light for
from 10 minutes to 2 hours according to the strength of the light, and then steeped in
a cold water bath for about an hour, and then in another bath composed of about 6%
Pyrogallic acid to 100 per cent alcohol for about 10 minutes when it is placed in a
frame or on a plate and dryed.

page_text: As soon as completely dry it is covered with powdered zinc oxide or oxide of
bismuth which is rubbed in with the palm of the hand and thus pressing it into
the deep parts and leaving the upper parts or lines free, the surplus powder being
removed.
The pigment paper thus prepared is placed in front of the camera and a negative
can be produced in the usual way.
This negative is removed from the glass, and placed between the negative of the
photo to be reproduced and a pigment paper which has been prepared with a strong
solution of gelatine containing only a small quantity of pigment and then copied as
usual thereby producing a position on the pigment with the same irregular surface as
that on the negative, which is necessary to. print from.
•
The printing block is prepared as follows:
The gypsum plate is placed under water and upon it the positive and then the plate
with the positive is removed from the water and the positive pressed against the plate
by an india rubber roller or squeezer to remove any air that may be between the
positive closely adhereing to the plate, it is then pressed a little in a press and then'
placed in a lukewarm bath composed of 10 per cent sulpho cyanure ammonium or
Rhodon-ammonium in water which will disolve those parts, which are not or only
partially developed.
When removed from this bath and washed in cold water it is placed in a bath
composed of 5 per cent chrome alum in water for about 5 minutes then removed and
washed and immersed in a bath of concentrated alcohol and dried and then impressed
into a plastic mass composed of bone dust, albumen, blood and silicate of soda, the
proportions depending on the hardness required, any other suitable plastic substance
may be used such as celluloid cyanoid &c. by means of an hydraulic press or other
suitable means steam being introduced during the operation as is usual in filter
presses.
When cold it is removed from the press.

page_text: 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 REPRO-
DUCING PHOTOS IN COPPER PLATE LITHOGRAPHIC OR PRINTING PRESSES
" a communi-
cation to me from abroad by Louis Collardon, Captain of 1204 Cordoba in the City
of Buenos Ayres in the 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 preformed to be particularly described, and ascertained in and by the
following statement :-
The object of this invention is to reproduce Photos in Copper-plate Lithographic or
printing presses in a better and cheaper manner than heretofore by means of the common
photographic press.
In order to obtain such a result the photos to be reproduced must be provided with
a surface in relief as with the ordinary smooth surface such reproduction is impossible.
For this purpose a specially prepared gypsum mass as also a specially prepared
pigment paper is required from the latter of which a negative is taken and which can
then be used as a medium for producing an irregular surface of crooked lines and
figures from the half tones.
The gypsum mass is composed of 1 to 6 per cent chalk and 50 per cent water to
each 100 parts gypsum, the latter together with the chalk being finely powdered and
well worked with the water to obtain an homogenous mass which is then pressed into
plates of suitable size having a polished surface when dry.
The pigment paper is prepared as follows:-
Common black pigment paper is placed in a bath composed of 4 per cent.
Bichromate of Potash to 100 per cent water for from 1 to 5 minutes as required and
then dried in a temperature of 60° to 70° Celcius. The paper is then exposed to the
day light for from 10 minutes to 2 hours according to the strength of the light and
then placed in cold water for about an hour, and then in another bath composed of
about 6 per cent Pyrogallic acid to 100 per cent alcohol for about 10 minutes, when
it is placed in a frame or on a plate and dried.
As soon as completely dry it is covered with powdered oxide of zinc, or oxide of
bismuth which is rubbed in with the palm of the hand thus pressing it into the deep
parts, and leaving the upper parts or lines of the figures free, the surplus powder being
removed..
The pigment paper thus prepared is placed in front of the camera and a negative
produced in the usual way.
This negative is removed from the glass and placed between the negative, of the
photo to be reproduced, and a pigment paper which has been prepared with a strong

page_text: solution of gelatine, containing only a small quantity of pigment, and then copied as
usual thereby producing a positive on the pigment paper, with the same irregular
surface as that on the negative which is necessary to print from.
The printing block is prepared as follows:-
may
be
The gypsum plate is placed under water, and upon it the positive also under water,
and then the plate with the positive is removed from the water, and the positive pressed
against the plate by an india rubber roller or squeezer to remove any air that
between, the positive closely adhereing to the plate, it is then pressed slightly in a press,
and then placed in a bath composed of water and 10 per cent sulpho cyanure
ammonium or Rhodon ammonium which will disolve those parts which are not or
only partially developed.
When removed from this bath and washed in cold water it is placed in a bath
composed of 5 per cent chrome alum in water for about 5 minutes then removed
and washed and immersed in a bath of concentrated alcohol and dried and then
impressed into a plastic mass composed of bone dust, albumen, blood, and silicate
of soda, the proportions depending on the hardness required. Any other plastic
substance may be used such as celluloid, cyanoid &c. by means of an hydraulic
press or other suitable means, steam being introduced during the operation as is
usual.in filter presses. When cold it is removed from the press.
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 reproducing Photos consisting in the production of a peculiar
negative in connection with a black pigment paper, which after having been
exposed to the light, is covered and rubbed in with oxide of zinc, or oxide of
bismuth to transform the half tones into irregular surfaces suitable for reproduction
in any printing press; copying the said negative on pigment paper and transferring
it to a specially prepared gypsum plate which is then impressed into a plastic
mass composed of bone dust, albumen, blood, and silicate of soda, or any other suitable
plastic substance, and then forms the definite printing block, substantially as
hereinbefore described.