Engraved Plates or Rollers for Printing.
Year: 1886

page_text: Date of Application, 15th Dec., 1886
Complete Left, 14th Sept., 1887.
Complete Accepted, 14th Oct., 1887
Engraved Plates or Rollers for Printing.
We MARY WALKER and GEORGE EDWARD WALKER, trading as Sampson
Bridgwood and Son of Anchor Pottery, Longton, in the County of Stafford,
Earthenware Manufacturers, and JEAN BAPTISTE GERMEUIL BONNAUD, of Longton
aforesaid, Photographer, do hereby declare the nature of this invention to be as
follows:-
In our Specification No. 13,609 of 1885 we described a process for producing copies
of lithography from photographic or other designs, and in a Provisional Specification
filed on this day we describe an improved process for this purpose the said process
being applicable also for producing typographic as well as lithographic formes. Our
present invention relates to a process whereby the operations described in these
Specifications are applied along with farther operations to the production of engraved
plates or rollers for printing. For this purpose, the pellicule produced as described in
the Specifications above referred to, consisting of a sheet of paper or a film of collodion
and of a layer thereon consisting of a mixture of dextrine starch and kaolin on which
a tracing has been made with lithographic ink or crayons is placed face downwards
and pressed on the plate or on the surface of the roller that is to be engraved. The
film is then removed leaving the lithographic ink or colour of the drawing on the plate
or roller. On this is electroplated a metal less easily attacked by acid than the metal
of the plate or roller itself. Thus if the plate or roller be of zinc, copper is electroplated
on it; if it be of copper, gold or platinum is electroplated on it. The metal thus
deposited appears only on those parts of the surface which have none of the lithographic
ink or colour. By applying a solvent such as turpentine or benzine. the lithographic
ink or colour is removed and, the whole surface is then treated with acid, whereby the
parts which had been occupied by the lithographic matter are etched to any desired
depth, the rest of the surface formed by the less corrosible metal remaining unaffected
by the acid.
•
Doted this Fifteenth day of December 1886.
ABEL & IMRAY,
Agents for the Applicants.

page_text: Process for Producing from Photographic and other Designs
Engraved Plates or Rollers for Printing.
We, MARY WALKER, and GEORGE EDWARD WALKER, trading as Sampson
Bridgwood and Son of Anchor Pottery, Longton, in the County of Stafford, Earthen-
ware Manufacturers, and JEAN BAPTISTE GERMEUIL BONNAUD of Longton aforesaid,
Photographer, 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 thereof :-
--
In our Specifications No. 13,609 of 1885 and 2770 of 1887 we described means of
producing copies for lithography from photographic or other designs. Our present
invention relates to a process whereby the operations described in these Specifications
are applied along with farther operations to the production of engraved plates or
rollers for printing. For this purpose the pellicule produced as described in the
Specifications above referred to, consisting of a sheet of paper or a film of collodion
and having on it a layer consisting of a mixture of dextrine, starch and kaolin on
which a tracing has been made with lithographic ink or crayons, is placed face down-
wards and pressed on the plate or on the surface of the roller that is to be engraved.
The body of the pellicule or film is then removed leaving the lithographic ink or
colours of the drawing on the plate or roller. On this is electroplated a inetal which
is less easily attacked by acid than the metal of the plate or roller itself. Thus, if the
plate or roller be of zinc, copper is electroplated on it, if it be of copper, gold or
platinum is electroplated on it. The metal thus deposited appears only on those parts
of the surface which have none of the lithographic ink or colour. By applying a
solvent such as turpentine, or benzine, the lithographic ink or colour is removed and
the whole surface is then treated with acid, whereby the parts which had been occupied
by the lithographic matter are etched to any desired depth, the rest of the surface
formed by the less corrosible metal remaining unaffected by the acid.
Having now particularly described and ascertained the nature of this inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
The herein described process for producing engraved plates or rollers for printing,
by transferring to the surface to be engraved the design lithographed on a film or
pellicule, removing the body of the film or pellicule, leaving the ink or colour of the
design, electroplating the surface, dissolving out the ink or colour of the design and
etching.