IMPROVEMENTS IN THE MANUFACTURE OF PLATES FOR HELIO- GRAPHIC ENGRAVING
Year: 1868

page_text: LETTERS PATENT to Arthur Charles Henderson, of No. 31, Charing
Cross, in the County of Middlesex, Patent Agent, for the Inven-
tion of "IMPROVEMENTS IN THE MANUFACTURE OF PLATES FOR HELIO-
GRAPHIC ENGRAVING."A communication from abroad by Octave
PROVISIONAL SPECIFICATION left by the said Arthur Charles
Henderson at the Office of the Commissioners of l'atents, with his
Petition, on the 7th May 1868.
1, ARTHUR CHARLES HENDERSON, of No. 31, Charing Cross, in the
County of Middlesex, l'atent Agent, do hereby declare the nature of
THE MANUFACTURE OF PLATES
the said Invention for "IMPROVEMENTS IN
FOR HELIOGRAPHIC ENGRAVING," a communication from abroad by Octave
Victor Fournier, of Paris, in the Empire of France, to be as follows:-
One of the principal drawbacks to heliographic engraving is the
difficulty in obtaining plates possessing a grain or hatching capable of
retaining the printing ink and thus impeding the striking off of proofs.
0.7 1

page_text: The object of the present Invention is to remedy this defect, and
consists in,-
1st. Taking a photographic proof on glass of the hatching desired to
be produced, and which has been previously printed or traced on a
surface of any kind and by any known means.
This hatching may be
square, lozenge, dotted, or otherwise, according to the nature of the
engraving required.
2ndly. By obtaining by transparency a proof positive on glass of the
subject or object that is to be reproduced.
And, thirdly. By placing these two proofs one on the other so as to
touch and taking from them by transparency a second negative proof,
which latter when regarded transparently has the effect of the repro-
duction of an engraving, this is to say, that this second proof is marked
with a grain or hatching that it does not naturally possess.
This proof
is then employed in obtaining a heliographic plate by the ordinary and
well-known means.
The Invention therefore consists in first procuring a photographic
proof of the grain or hatching desired; secondly, in obtaining either a
proof positive of a photographic plate or of the object itself to be
reproduced; and thirdly, in taking a negative proof on glass of the
two preceding plates placed one over the other, from which, as already
mentioned, the heliographic plates are produced by the ordinary and
well-known means.
SPECIFICATION in pursuance of the conditions of the Letters l'atent,
filed by the said Arthur Charles Henderson in the Great Seal
Patent Office on the 6th November 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, 1, ARTHUR
CHARLES HENDERSON, of No. 31, Charing Cross, in the County of
Middlesex, l'atent Agent, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Seventh day of May, in the year of
our Lord One thousand eight hundred and sixty-eight, in the thirty-
first year of Her reign, did, for Herself, Her heirs and successors,
give and grant unto me, the said Arthur Charles Henderson, Her

page_text: special licence that T,. the said Arthur Charles Henderson, my
executors, administrators, and assigns, or such others as I, the said
Arthur Charles Henderson, my executors, administrators, and assigns,
should at any time agree with, and no others, from time to time
and at all times thereafter during the term therein expressed, should
and lawfully might make, use, exercise, and vend, within the United
Kingdom of Great Britain and Ireland, the Channel Islands, and
Isle of Man, an Invention for "IMPROVEMENTS IN THE MANUFACTURE OF
PLATES FOR HELIOGRAPHIC ENGRAVING," a communication to me from
abroad by Octave Victor Fournier, of Paris, in the Empire of France,
upon the condition (amongst others) that I, the said Arthur Charles
Henderson, my executors or administrators, by an instrument in writing
under my, or their, or one of their hands and seals, should
ticularly describe and ascertain the nature of the said Invention, and
in what manner the same was to be performed, and cause the same
to be filed in the Great Seal Patent Office within six calendar months
next and immediately after the date of the said Letters Patent.
par-
NOW KNOW YE, that 1, the said Athur Charles Henderson, do
hereby declare the nature of my said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained
in and by the following statement :-
One of the principal drawbacks in heliographic engraving is the
difficulty in obtaining plates possessing a grain or hatching capable of
retaining the printing ink, and thus impeding the striking off of proofs.
The object of the present Invention is to remedy this defect, and
consists in,
First. Taking a photographic proof on glass of the hatching desired
to be produced, and which has been previously printed or traced on a
surface of any kind, and by any known means. This hatching may be
square, lozenge, dotted, or otherwise according to the nature of the
engraving required.
Secondly. By obtaining by transparency, a photographic proof positive
on glass of the subject or object that is to be produced.
And, thirdly. By placing these two proofs one on the other so ns to
touch and taking from them by transparency a second negative proof,
which latter when regarded transparently has the effect of the repro-
duction of an engraving, that is to say, that this second proof is marked

page_text: with a grain or hatching that it does not naturally possess. This proof
is then employed in obtaining a heliographic plate by the ordinary and
well-known means. A similar but less satisfactory result may be
obtained by taking in two different positions the image of the grain or
hatching and the object itself on the same plate, and vice versa.
The Invention therefore consists in first procuring a photographic
proof of the grain or hatching desired; secondly, in obtaining either a
proof positive on glass of a photographic plate or of the object to be
reproduced; and, thirdly, in taking a negative proof on glass of the two
preceding plates placed one over the other, from which, as already
mentioned, the heliographic plates are produced by the ordinary means.
Having thus described my, Invention, what I claim and desire to
secure by Letters Patent is, the mode of manufacturing plates for
heliographic engraving in the manner herein-before mentioned.
In witness whereof, I, the said Arthur Charles Henderson, have
hereunto set my hand and seal, this Sixth day of November,
in the year of our Lord One thousand eight hundred and sixty-
eight.