A NEW OR IMPROVED METHOD OF AND MEANS OR APPARATUS FOR PREPARING DRAWING OR TRANSFER PAPER WITH A TINTED AND EMBOSSED SURFACE FOR USE IN LITHOGRAPHY, PHOTOLITHOGRAPHY, PHOTOGRAPHY, AND ZINCOGRAPHY, AND IN THE PRODUCTION OF RAISED SURFACE BLOCKS
Year: 1881

page_text: LETTERS PATENT to David Bogue and Benjamin Constant Le Moussu, both
of the Strand, in the County of Middlesex, Photo-engravers, for an
Invention of "A NEW OR IMPROVED METHOD OF AND MEANS OR APPARATUS
FOR PREPARING DRAWING OR TRANSFER PAPER WITH A TINTED AND EMBOSSED
SURFACE FOR USE IN LITHOGRAPHY, PHOTOLITHOGRAPHY, PHOTOGRAPHY,
AND ZINCOGRAPHY, AND IN THE PRODUCTION OF RAISED SURFACE
BLOCKS."
PROVISIONAL SPECIFICATION left by the said David Bogue and Benjamin
Constant Le Moussu at the Office of the Commissioners of Patents on the
17th August 1881.
DAVID BOGUE and BENJAMIN CONSTANT LE MOUSSU, both of the Strand, in the
County of Middlesex, Photo-engravers. "A NEW OR IMPROVED METHOD OF AND
MEANS OR APPARATUS FOR PREPARING DRAWING OR TRANSFER PAPER WITH A
TINTED AND EMBOSSED SURFACE FOR USE IN LITHOGRAPHY, PHOTOLITHOGRAPHY,
PHOTOGRAPHY, AND ZINCOGRAPHY, AND IN THE PRODUCTION OF RAISED SURFACE
BLOCKS."
According to our Invention our tinted and embossed paper is prepared by coating
the surface with a composition which may be easily scraped, printing over this a
ruled tint, and then finishing with a dry embossed block pressed across the tint.
The pressure of this latter block presses in the ink at the points of intersection of the
lines, points or dots leaving the relief lines, on which the pencil will produce squares
of graduated intensity up to perfect black. The printed tint will remain inter-
mediate between the added work and the gradation to be obtained by a scraper, by
means of which the printed tint being taken off the points or dots will remain,
which in turn may be removed at will when the full or high lights are

page_text: We can also make the lines or points of our printing plates round, in order to
obtain a softer gradation.
We also engrave the relief lines of the pressure giving block more or less conical,
or of other suitable form, or even give them one or many intermediary surfaces by
means of a tool having the required outline. The block so engraved will produce
lines of different strength at different depths, thereby leaving more resources for
the scraper.
We also print and press in any manner, and with any kind of blocks, whether
stippled, grained, or lined, the prepared paper, or any prepared surface or substance
that will answer the purpose.
We can also prepare the surface of our paper with any of the usual compositions
for the purpose of obtaining a direct transfer.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said David Bogue and Benjamin Constant Le Moussu in the Great Seal
Patent Office on the 16th February 1882.
DAVID BOGUE and BENJAMIN CONSTANT LE Moussu, both of the Strand, in the
County of Middlesex, Photo-engravers. " A NEW OR IMPROVED METHOD OF AND
MEANS OR APPARATUS FOR PREPARING DRAWING OR TRANSFER PAPER WITH A
TINTED AND EMBOSSED SURFACE FOR USE IN LITHOGRAPHY, PHOTOLITHOGRAPHY,
PHOTOGRAPHY, AND ZINCOGRAPHY, AND IN THE PRODUCTION OF RAISED SURFACE
BLOCKS."
According to our Invention we prepare our tinted and embossed drawing or
transfer paper by coating the surface with a composition which may be readily
scraped; or we may employ paper or other substance to which several layers or
coatings of enamel have been given, and treat the same in the manner as hereinafter
described. On the paper thus prepared we print a ruled or dotted tint from a
lithographic stone, or from a copper or steel plate, or from a wood or other relief
block, and then finish off by pressing across this tint a relief block. On pressure
being applied to this relief block the ink is pressed in at the intersections of the
printed and embossed lines, points, or dots, thus leaving relief lines, points, or dots.
On these relief lines, points, or dots, divided tints of graduated intensity, up to
perfect black, may be produced by means of a pencil, chalk, or brush. The printed
and embossed tint remains intermediate between the added work and the gradation
sought, such gradation being obtained by means of a scraper, which by taking off
portions of the printed tint leaves points or dots, which in turn can also be removed
by the scraper when full or high lights are required.
The drawing so made on the paper thus prepared is now ready to go through the
usual processes of photography, photolithography, or phototypography, the last
process producing raised surface blocks, which may be employed for printing
purposes.
The relief lines of the pressure giving block or plate may be more or less conical,
round, undulated, or curved (in vertical cross section), or of other suitable form; or
we may even give them one or more intermediate surfaces by means of a tool
having the required outline. The block or plate so engraved will produce at
different depths lines of different strength, whereby more resources for the scraper
are obtained; or the pressure giving plate or block may be grained, so that the
work in chalk or pencil shall be still more divided and soft.
We can also print and emboss in any manner, and with any kind of blocks or
plates, whether stippled, grained, or lined, or any combinations thereof, the prepared
paper or any prepared surface or substance that will answer the purpose, as for
instance silk, cloth, parchment, or leather.
"
The surface of our paper may also be prepared with any of the usual compositions
employed, for the purpose of obtaining a direct transfer; or we can use, for instance,
"Scotch
transfer paper, with as thick a coating as may be required, and
print upon it a tint, and afterwards emboss the surface in the manner above
described.
The drawing made on this paper (the tinted surface of which has been printed
with transfer ink, and afterwards embossed) with lithographic chalk, or lithographic
ink, or chalk and ink, is now ready for ordinary transfer.
Having now described the nature of our said Invention, and in what manner the
same may be performed, we declare that we claim,―
1. The preparation of drawing or transfer paper with a surface readily scraped,
on which is printed a tint, the said tint being afterwards embossed with a stippled,

page_text: grained, or lined plate or block, or a lined and grained plate or block, or any
combination or combinations thereof, substantially as specified, for the purposes set
forth.
2. The employment and application of the relief blocks or plates having conical,
curved, or undulated lines (in vertical cross section), or one or many intermediate
surfaces, for the purpose of giving to the paper a surface affording greater resources
to the scraper, and thus obtaining the desired gradation of lights and shades for the
drawing, substantially as specified.
3. Printing and embossing the transfer paper or other suitable substance in the
manner set forth, so that the drawing made in lithographic ink or chalk, or in ink
and chalk, can be applied to plate or stone for the purpose of obtaining a transfer
therefrom, substantially as specified.
In witness whereof, we, the said David Bogue and Benjamin Constant Le
Moussu, have hereunto set our hands and seals, this Fifteenth day of
February, in the year of our Lord One thousand eight hundred and
eighty two.
DAVID BOGUE.
(L.S.)
BENJAMIN CONSTANT LE MOUSSU. (L.S.)