AN IMPROVEMENT IN THE MANUFACTURE OF COPYING PAPER'
Year: 1857

page_text: LETTERS PATENT to James Hogg, junior, Publisher, of Number 18, St.
Andrew Square, Edinburgh, in the County of Edinburgh, for the In-
vention of "AN IMPROVEMENT IN THE MANUFACTURE OF COPYING PAPER'."
Sealed the 15th June 1858, and dated the 15th December 1857.
PROVISIONAL SPECIFICATION left by the said James Hogg at the
Office of the Commissioners of Patents, with his Petition, on the
15th December 1857.
I, JAMES HOGG, junior, Publisher, of Number 18, St. Andrew Square,
Edinburgh, in the County of Edinburgh, do hereby declare the nature of
the said Invention for "AN IMPROVEMENT IN THE MANUFACTURE OF COPYING
PAPER," to be as follows:-
I manufacture "copying paper" in the ordinary way, but impregnate it
with a preparation of iron. The preparation of iron which I prefer is a strong
solution of the protosulphate of iron, but I do not confine myself to that
particular salt; other preparations of iron may be used.
The manner in which I impregnate the "copying paper" with the prepa-
ration of iron is either by incorporating it by any convenient means in the
making of the paper (that is to say, when the paper is in the pulp); or after the
paper is made I pass it between felt-covered rollers supplied with a solution
of the protosulphate or other suitable preparation of iron; or after the paper
is made any other convenient method of impregnation may be adopted.

page_text: The advantages of my improvement are two :-1. A letter written with
common writing ink, having an infusion of nntgalls or the tanno-gallate of
iron as its base, when covered with a damp sheet of my "copying paper,"
and squeezed in a "copying press," will give a good copy. 2. A letter written
with ink, similar to that just mentioned, but to which there has been added
a little pyrogallic acid and sugar, such writing, when covered with a damp
sheet of my "copying paper," will yield a good copy by the simple pressure of
the hand. It is only necessary to put a sheet of blotting or oil paper between
the damp "copying paper" and the hand, and then rub over the writing
firmly as in the act of blotting a letter.
It will thus be seen that my improved "copying paper" will give, by tho
nid of a press, a good copy from the great majority of writing inks (viz., tanno-
gallate inks) in common use, a result which cannot be obtained from ordinary
"copying paper." And farther, my improved "copying paper" will give a
good copy by the simple pressure of the band from any writing which has
been written with ink prepared according to the method which I have indi-
cated above, thus dispensing with the use of any "copying press."
I claim as of my Invention the manufacture of "copying paper" impreg
nated with a preparation of iron, either the protosulphate or other convenient
preparation of iron, which serves to produce, in conjunction with writing iuks,
such effects as I have herein-before described.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said James Hogg in the Great Seal Patent Office on the 15th
Juno 1858.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JAMES
Hooa, junior, Publisher, of Number 18, St. Andrew Square, Edinburgh, in
the County of Edinburgh, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Fifteenth day of December, A. D. One thousand eight
hundred and fifty-seven, in the twenty-first year of Her reign, did, for Herself,
Her heirs and successors, give and grant unto me, the said James Hogg,
junior, Her special licence, that I, the said James Hogg, junior, my exc-
cutors, 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

page_text: the Isle of Man, an Invention for "AN IMPROVEMENT IN THE MANUFACTURE OF
COPYING PAPER," upon the condition (amongst others) that I, the said James.
Hogg, junior, by an instrument in writing under my hand and seal, should
particularly 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 High Court of Chancery within six calendar months next and immediately.
after the date of the said Letters Patent.
.
NOW KNOW YE, that I, the said James Hogg, junior, 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 fol-
lowing statement (that is to say) :-
.:-
I manufacture "copying paper" in the ordinary way, but impregnate it
with a preparation of iron. The preparation of iron which I prefer is a strong
solution of the protosulphate of iron, but I do not confine myself to that
particular salt; other preparations of iron may be used.
The manner in which I impregnate the "copying paper" with the prepara-
tion of iron is either by incorporating it by any convenient means in the
making of the paper (that is to say, when the paper is in the pulp); or after
the paper is made I pass it between felt-covered rollers supplied with a
solution of the protosulphate or other suitable preparation of iron; or after
the paper is made any other convenient method of impregnation may be
adopted.
The advantages of my improvement are two :-[1.] A letter written with
common writing ink, having an infusion of nutgalls, or the tanno-gallate of
iron as its base (or any ink containing tannin), when covered with a damp
sheet of my "copying paper," and squeezed in a "copying press," will give a
good copy. [2] A letter written with ink similar to that just mentioned,
but to which there has been added a little pyrogallic acid and sugar, such
writing, when covered with a damp sheet of my "copying paper," will yield a
good copy by the simple pressure of the hand. It is only necessary to put a
sheet of blotting paper or oil paper between the damp "copying paper" and
the hand, and then rub over the writing firmly as in the act of blotting a
letter.
It will thus be seen that my improved "copying paper" will give, by the
aid of a press, a good copy, from the great majority of writing inks (viz.,
tanno-gallate or tannate inks) in common use, a result which cannot be so well
obtained from ordinary "copying paper." And farther, my improved "copy-
ing paper" will give a good copy, by the simple pressure of the hand, from
any writing which has been written with iuk prepared according to the method

page_text: which I have indicated above, thus dispensing with tho use of any "copying
press."
I claim as of my Invention the manufacture of "copying paper" impreg-
nated with a preparation of iron, either the protosulphate or other convenient
preparation of iron, which serves to produce, in conjunction with writing inks,
such effects as I have herein-before described.
In witness whereof, I, the said James Hogg, junior, have heretofore set
my hand and seal, this First day of June, A. D. One thousand eight
hundred and fifty-eight.
JAMES HOGG, JUNIOR.. (L.B.)