IMPROVEMENTS IN THE PREPARATION OR MANUFACTURE OF PHOTO- GRAPHIC PLATES OR SURFACES FOR USE IN THE PRODUCTION OF ETCHED OR PRINTING SURFACES
Year: 1884

page_text: [Communicated from abroad by Edward Kunkler, of St. Gall, in the Republic of
Switzerland, Civil Engineer, and Jacques Brunner, of Kiissnacht, in the
Cunton of Zurich, in the aforesaid Republic, Photographer and Art Printer.]
I ALFRED GEORGE BROOKES of 55 Chancery Lane in the County of Middlesex
Fellow of the Institute of Patent Agents do hereby declare the nature of my
invention for IMPROVEMENTS IN THE PREPARATION OR MANUFACTURE OF PHOTO-
GRAPHIC PLATES OR SURFACES FOR USE IN THE PRODUCTION OF ETCHED OR PRINTING
SURFACES to be as follows:-
These improvements have reference to an invention for which I have applied for
Letters Patent with a provisional specification on the 29th day of January last
No 2312 and the invention has for its object to enable an existing photographic
negative or picture on a plate or film to he utilised for the preparation of surfaces
for printing or etching with, by applying to such existing plate or filmn, having the
image or picture upon it, a sensitive film or layer upon which added layer the
desired graining or hatching has been produced in the manner already described in
my said former provisional specification.
In the case of negative or positive plates or films bearing pictures or images the
surfaces of which have been varnished it is necessary to remove (say) by means of
caustic potash or other suitable means that varnish and then having treated that
plate or film with an insulating film or conting, the sensitive layer to be hatched or
grained, or prepared with like markings, is applied and treated as described in my
said former provisional specification for the like end.

page_text: I ALFRED GEORGE BROOKES of 55 Chancery Lane in the County of Middlesex
Fellow of the Institute of Patent Agents do hereby declare the nature of my
invention for IMPROVEMENTS IN THE PREPARATION OR MANUFACTURE OF PHOTO-
GRAPHIC PLATES OR SURFACES FOR USE IN THE PRODUCTION OF ETCHED OR PRINTING
SURFACES, and in what manner the same is to be performed, to be particularly
described and ascertained in and by the following statement:-
These improvements have reference to an invention for which I have obtained
Letters Patent, having previously lodged a complete specification fully describing
the said invention, dated the 29th day of January 1884 N° 2312 and the present
invention has for its object to enable an existing photographic negative or picture
on a plate or film to be utilised for the preparation of surfaces for printing or
etching with, by applying to such existing plate or film, having the image or picture
upon it, a sensitive film or layer upon which added layer the desired graining or
hatching has been produced in the manner already described in my said former
complete specification.
In the case of negative or positive plates or films bearing pictures or images the
surfaces of which have been varnished it is necessary to remove (say) by means of
caustic potash or other suitable means that varnish and then having treated that
plate or film with an insulating film or coating, the sensitive layer to be hatched or
grained or prepared with like markings is applied and treated as described in my
said former complete specification for the like end.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, as communicated to
me by my foreign correspondent, I declare that what I claim is
The production of a grained or stippled surface upon a film or layer of Chrom
Gelatine or other similar substance applied on an existing photographic picture or
image substantially as and for the purposes herein before described.
Dated this 30th day of March 1855.
W
BROOKES & SON,
55, Chancery Lane, London,
Agents for the said Alfred George Brookes.