A Method of Making Negatives in Relief, or Sheets of Raised Type, on Tin Foil or Thin Metallic Sheets by Means of Typewriting Machines, from which Copies can be Printed and Multiplied.
Year: 1893

page_text: Date of Application, 28th Aug., 1893
Complete Specification Left, 30th Nov., 1893-Accepted, 24th Mar., 1894
PROVISIONAL SPECIFICATION.
A Method of Making Negatives in Relief, or Sheets of Raised Type,
on Tin Foil or Thin Metallic Sheets by Means of Typewriting
Machines, from which Copies can be Printed and Multiplied.
We, WILLIAM CORDEAUX, Barrister-in-law, and JOHN HETHERTON, Incorpo-
rated Accountant, both of Exchange Chambers, Clifford Street, York, do hereby
declare the nature of this invention to be as follows:-
The object of this invention is to produce negatives in relief, from which copies
of typewritten matter may be printed and multiplied, and this is accomplished by
placing in a typewriting machine a metallic sheet of suitable thickness and of a soft
and flexible nature, it may either be pure tin foil or a mixed foil of lead and tin,
we prefer the latter, or it may be any soft thin metallic sheet, such as copper.
This sheet is placed in the typewriter as if it were intended to be typewritten in
the usual way. The ribbon (if any) being first removed; but between it and the
roller or other surface upon which it rests, we place a sheet of soft paper, or india-
rubber or other material, or instead of backing it with a soft material and in order
to prevent it coming into close contact with the roller or surface on which it rests,
it may be kept slightly suspended or raised therefrom by a thin narrow strip of
steel or other material being placed just above or below, or both, the line of writing,
but in either case when the type strikes the metallic sheet an indentation is made
on it, and when the writing is completed and the sheet is removed we find on
reversing it that a negative in relief has been produced, that is to say, the metallic
sheet has not only been indented but the metal has been forced outwards on the
reverse side to which it was struck by the type, so that the shape and character of
the type stands out in bold relief, just in the same way as a stereotype block taken
from ordinary type appears. We have thus produced a negative in relief or sheet
of raised type from which copies can be printed.
The copies are printed on a machine which is the subject of a Patent, the title
of which is, "An Improved Method and Apparatus for Printing Copies of Writing,
Music, Drawings and Plans, from Negatives in Relief on Tin Foil or Thin Metallic
Sheets," No. 18,835, and dated December 24th, 1888. Letters Patent being
granted to the above named William Cordeaux. It is not necessary further to
explain the process of printing copies as the subject and novelty of this invention
consists only in the method of making a stereotype negative substantially in the
manner herein described.
Dated this 26th day of August 1893.
WILLIAM CORDEAUX,
JOHN HETHERTON.
COMPLETE SPECIFICATION.
A Method of Making Negatives in Relief, or Sheets of Raised Type,
on Tin Foi! or Thin Metallic Sheets by Means of Typewriting
Machines, from which Copies can be Printed and Multiplied.
We, WILLIAM CORDEAUX, Barrister-at-Law, and JOHN HETHERTON Incorpo-
rated Accountant, both of Exchange Chambers, Clifford Street, York, in the
County of York, do hereby declare the nature of this invention and in what
Pri od 1

page_text: manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
The object of this invention is to produce negatives in relief, or sheets of raised
type on metallic sheets by means of type writing machines, from which negatives,
copies may be printed and multiplied, and this is accomplished by placing in a type
writing machine a metallic sheet of suitable thickness and of a soft and flexible
nature, which may be more particularly described as follows:-
The sheet is composed of a mixture of lead and tin. It may, however, be made
of other soft, tough metallic foil, such as pure tin foil, or very thin copper. If a
mixture of lead and tin be employed, we prefer that which is manufactured by
H. Erhardt and Co., Walbrook, London, and known in the trade as double plated
foil, the nature and quality of it being such that eight square feet of it make about
one pound in weight.
This sheet is placed in the type writing machine in the following manner :-
Between the metallic sheet and the roller, or other surface upon which the paper
would rest, (if we were type writing in the usual way) we place one sheet of thick
blotting paper, or one or more sheets of soft paper, or other material. We find
one sheet of thick soft blotting paper answers the purpose, and it is an advantage,
though not essential, to have the blotting paper, or other backing material, damp
enough to make the metallic sheet adhere more closely to it than it otherwise
would. As all type writing machines are not constructed alike, it may be necessary
to change the position of certain parts to allow the metallic sheet and backing,
which are together thicker than ordinary paper, to be fixed properly in the machine,
as, for instance, the ribbon (if any) should be removed, and any cross bars or other
parts which would interfere, or disturb the metallic sheet, should be removed or
partly released from their usual position.
Having thus fixed the metallic sheet, backed as above described, we work the
type writing machine in the usual way, and the result is that, when the type strikes
the metallic sheet, or when the metallic sheet is forced into contact with the type,
an indentation is made on it, and, when the writing is completed and the sheet is
removed, we find on reversing it that a negative in relief has been produced, that
is to say, the metallic sheet has not only been indented, but the metal has been
forced outwards on the reverse side to which it was struck by the type, in such a
manner that the shape and character of the type stand out in relief just in the same
way as a stereotype block taken from ordinary type appears.
We have thus pro-
duced a negative in relief, or a sheet of raised type from which copies can be
printed.
The copies can be printed and multiplied on a machine which is the subject of a
Patent, the title of which is "An Improved Method and Apparatus for Printing
Copies of Writing, Music, Drawings and Plans from Negatives in Relief on Tin Foil
or Thin Metallic Sheets," No. 18,835, and dated December 24th, 1888; Letters
Patent being granted to the above named William Cordeaux. It is not necessary
further to explain the process of printing the copies, as the subject and novelty of
this invention consist only in the method of making a stereotype negative
substantially in the manner herein described.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed, we declare that
what we claim is :-
1. The method of making negatives in relief, which consists in placing a metallic
sheet, such as herein particularly described, or any other like thin metallic sheet
such as described, in a type writing machine, having first placed the metallic sheet
upon a soft or yielding surface, so that the metallic sheet is indented or impressed
when struck by, or otherwise brought into contact with, the type of the type
writing machine, and in such a manner as to cause the shape and character of the
type to appear in relief on the reverse side of the metallic sheet, substantially as
herein described.

page_text: 2. The method of making negatives in relief taken as a whole substantially in
the manner and for the purpose as herein described.
Dated this 29th day of November 1893.
WM. P. THOMPSON & Co.,
Of Liverpool, Manchester, Nottingham, and London, Patent Agents.
.