Improvements in and relating to Plates for Forming Stencils to Produce. Copies of Writings, Drawings, and the like.
Year: 1891

page_text: Date of Application, 15th Oct., 1891
Complete Specification Left, 7th July, 1892-Accepted, 13th Aug., 1892
PROVISIONAL SPECIFICATION.
· Improvements in and relating to Plates for Forming Stencils to
Produce. Copies of Writings, Drawings, and the like.
}
I, JOHN BRYCE, of the firm of John Bryce and Company Engravers, 23 and
27 Bellgrove Street, Glasgow, Lanarkshire, do hereby declare the nature of my
invention to be as follows:-
This invention has reference to and comprises a new or improved construction of
prepared or engraved metallic plates and method or mode and means of forming
same; to form stencils for producing copies of writings or correspondence, drawings,
delineations, or like matter, by forming a surface which will perforate the stencil
paper when traversed by a pencil or style and enable the ink or color to pass
through it to form the sharp impression; and which improvements will enable
large sizes of steel or metallic plates to be produced with uniform engraved or
finely line divided and true cutting surfaces, instead of the small surfaced blade
and file cut plates heretofore used for producing stencils.
By my improvements I first take a plate of sheet steel or other metal and bend or
form it into a cylinder or roller. I then rotate this cylinder and engrave its outer
surface with fluted, checked or "pin" lines, or grounds or "stipple" by a metallic
roll or "mill" running on its surface, said "mill" having been previously prepared
by being engraved on a die and raised in clams in the manner in which mills are
generally prepared. The "mill" in its motion over and while engraving the
metal cylinder runs spirally being traversed like the motion of a screw from end
to end of cylinder. The metallic cylinder thus engraved, when to be used to form
flat plates for producing stencils is then cut up into the sizes of plates desired to be
formed, and these are straightened to a flat shape by passing them through rollers
or otherwise with soft metal or other material on the engraved side to protect
same; and these plates may be hardened or tempered if so desired.
Dated the 14th October 1891
W. R. M. THOMSON. & Co.,
96, Buchanan Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improvements in and relating to Plates for Forming Stencils to
Produce Copies of Writings, Drawings, and the like.
I, JOHN BRYCE, of the firm of John Bryce and Company, Engravers, 23 and
27 Bellgrove Street, Glasgow, Lanarkshire, do hereby declare the nature of my
invention, and in what manner the same is to be performed to be particularly
described and ascertained in and by the following statement in writing, that is
to say:
My invention has reference to and comprises a new or improved construction of
prepared or engraved metallic plates and method or mode and means of forming
same to form stencils for producing copies of writings or correspondence, drawings,
delineations, or like matter, by forming a surface which will perforate the stencil
paper when traversed by a pencil or style and enable the ink or colour to pass
through it to form the sharp impression; and which improvements will enable large
sizes of steel or metallic plates to be produced with uniform engraved or finely
line divided and true cutting surfaces, instead of the small surfaced blade and file
cut plates heretofore used for producing stencils.
In carrying my improvements into practice I first take a plate of sheet steel or

page_text: other metal and bend or form it into a cylinder or roller. I then mount this cylinder
over the rotating spindle of an engraving machine and engrave its outer surface
with fluted, checked or "pin" lines, or grounds or "stipple" by a metallic roll or
steel tempered "mill" running on its surface, said mill having been previously
prepared by being engraved on a die and raised in clams in the manner in which
"mills" are generally prepared. The "mill" in its motion over and while
engraving the metal cylinder runs spirally, being traversed longitudinally from a
screw spindle in the engraving machine and receiving its circular motion from
surface contact with the rotating cylinder being engraved. The metallic cylinder.
thus engraved, when to be used to form flat plates for producing stencils is then cut
up into the sizes of plates desired to be formed, and these are straightened to a flat
shape by passing them through rollers or otherwise with soft metal or other material
on the engraved side to protect same; and these plates may be hardened or tempered
if so desired.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
--
First. The method of preparing plates for forming stencils consisting in first
bending them into a cylindrical shape and mounting them on a rotating spindle, then
engraving same by milling tools running spirally, and afterwards cutting up and
straightening the engraved plates into the sizes desired, substantially as and in the
manner set forth.
Second. Metallic cylindrical plates engraved in the manner herein described to
produce plates for forming stencils, substantially as set forth.
Third. Plates with finely line divided and true cutting surfaces to form stencils
for producing copies of writings, drawings, and the like, substantially as herein set
forth.
Dated the 6th Jul 1800
W. R. M. THOMSON & Co.,
96, Buchanan Street, Glasgow, Agents.