Improvements in Plates or Sheets employed in Producing Autographic Stencils.
Year: 1890

page_text: Date of Application, 17th Dec., 1890
Complete Specification Left, 17th Sept., 1891-Accepted, 17th Oct., 1891
PROVISIONAL SPECIFICATION.
Improvements in Plates or Sheets employed in Producing
Autographic Stencils.
I, DAVID GESTETNER, of 70 Chiswell Street, in the City of London, Manu-
facturer, do hereby declare the nature of this invention to be as follows:-
1
The invention has for its object improvements in plates or sheets employed in
the production of autographic stencils used in producing copies of writing and other
delineations..
Heretofore such plates or sheets have been formed of steel cut with a file like
surface, and it has been proposed to produce them of gelatine cast in moulds and
hardened.
The former of these processes is costly when employed in producing large plates
or sheets, and the latter has not been successfully brought into use.
According to my invention, I take a sheet or film of celluloid or such like
compound, or a sheet of metal, and pass it between a pair of rollers, one of which
is engraved or otherwise prepared as a die or reverse of the surface required.
These rollers are forced together with heavy pressure, so as to cause the surface of
the metal or celluloid sheet to assume the form in reverse of that of the roller. The
celluloid sheet is softened previous to being passed between the rollers..
I may use a flat die in lieu of a roller die to produce the desired surface.
Dated this 17th day of December 1890
DAVID GESTETNER.
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.
DAVID GESTETNER.
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.
COMPLETE SPECIFICATION.
Improvements in Plates or Sheets employed in Producing
Autographic Stencils.
I, DAVID GESTETNER, of 70 Chiswell Street, in the City of London, Manu-
facturer, 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 :-
The invention has for its object improvements in plates or sheets employed in
the production of autographic stencils used in producing copies of writing and other
delineations.
Heretofore such plates or sheets have been formed of steel cut with a file like
surface, and it has been proposed to produce them of gelatine cast in moulds and
hardened.
The former of these processes is costly when employed in producing large plates
or sheets, and the latter has not been successfully brought into use.
According to my invention I take a sheet or film of celluloid or such like
compound, or a sheet of metal, and pass it between a pair of rollers, one of which
is engraved or otherwise prepared as a die or reverse of the surface required.
These rollers are forced together with heavy pressure, so as to cause the surface of
the metal or celluloid shect to assume the form in reverse of that of the roller.
The celluloid sheet is softened previous to being passed between the rollers.
I may use a flat die in lieu of a roller die to produce the desired surface.
In carrying my invention into effect in the manufacture of metal sheets or plates
with file surfaces, I use heavy rolling or stamping mills, and I use a sort steel
D

page_text: plate, which is capable of receiving the impress of the engraved roll or die; after
the said soft steel plate has received the impress of the roll or die, it is hardened in
any usual or suitable manner and is then fit for use.
For celluloid or such like plates, less powerful machinery is necessary, as the
celluloid being previously softened, it more readily takes the form of the engraved
roll or die than a steel plate.
Metal or other plates or sheets formed with a file like surface are used in the
well known manner in the preparation of a stencil, namely, a sheet of waxed tissue
paper is stretched over such plate or sheet and a stylus, held in the hand as a pen,
is used to produce the required writing or delineation thereon, which, in conse-
quence of being made on paper supported by a file surface, full of perforations,
thereby forming a stencil through which ink is forced to produce the required
copies of writing or other delineation in the usual manner.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, 1 declare that what I
claim is :-
The manufacture of plates or sheets of the character referred to for producing
autographic stencils by means of engraved rolls or dies, substantially as herein
described.
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DAVID GESTETNER.
By Harris & Mills,
23, Southampton Buildings, London, W.C., Agents.