IMPROVE- MENTS IN THE MANUFACTURE OR PAPER."
Year: 1872

page_text: LETTERS PATENT to Francis Richard Henry Protheroe, of Lydney, in
the County of Gloucester, Chemist, for the Invention of "IMPROVE-
MENTS IN THE MANUFACTURE OR PAPER."
PROVISIONAL SPECIFICATION left by the said Francis Richard Henry
Protheroe at the Office of the Commissioners of Patents, with his
Petition, on the 3rd September 1872.
I, FRANCIS RICHARD HENRY PROTHEROE, of Lydney, in the County
of Gloucester, Chemist, do hereby declare the nature of the said Inven-
tion for "IMPROVEMENTS IN THE MANUFACTURE OF PAPER," to be as follows:-
This Invention has for its object improvements in the manufacture of
paper. The material which I employ for this purpose is tanners' bark.
It has often been proposed to use this material in the manufacture of
paper, but such attempts have failed because the material is found. tỏ
become discolored when it is treated in iron vessels.
According to my Invention I treat tanners' bark by boiling it with
caustic soda under pressure in a boiler which is galvanised on the inside,
and then after boiling I wash the material and use it in the manufacture
of half stuff and paper in the same way as is usual with wood, straw,.,
and esparto, and other materials which have been boiled with alkali.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Francis Richard Henry Protheroe in the Great
Seal Patent Office on the 1st March 1873.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, FRANCIS
RICHARD HENRY PROTHEROE, of Lydney, in the County of Gloucester,
Chemist, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Third day of September in the year of our
Lord One thousand eight hundred and seventy-two, in the thirty-sixth
year of Her reign, did, for Herself, Her heirs and successors, give and
grant unto me, the said Francis Richard Henry Protheroe, Her special
licence that I, the said Francis Richard Henry Protheroe, my executors,
administrators, and assigns, or such others as I, the said Francis Richard
Henry Protheroe, my executors, administrators, and assigns, should at any
time agree with, and no others, from time to time and at all times there-
after 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 PAPER," upon the condition (amongst
others) that I, the said Francis Richard Henry Protheroe, my executors
or administrators, by an instrument in writing under my, or their, or one
of their hands and seals, 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 Great Seal Patent
Office within six calendar months next and immediately after the date of
the said Letters Patent.
NOW KNOW YE, that I, the said Francis Richard Henry Protheroc,
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 :-
This Invention has for its object improvements in the manufacture of
paper. The material which I employ for this purpose is tanners' spent
bark. It has often been attempted to use this material in the manu-
facture of paper, but such attempts have failed because the pulp or half
stuff is found to become discolored when treated in iron vessels.

page_text: According to my Invention I treat the tan (or other fibrous matter)
by boiling it with caustic soda and lime under steam pressure in a boiler
which is galvanized on the inside. This boiler is set vertically as repre-
sented in Drawing (Fig. 1), letter A being the shell, B the cover, from
which I suspend a cage C which has to contain the tan during the
process of boiling. After charging the boiler with a solution of caustic
soda, and lime, I drop into it the cage containing the tan, and secure the
cover by means of screws or bolts, making it steam-tight. When
sufficiently boiled, I remove the material to a washing machine, in
which I thoroughly wash it and bleach it with chlorine or ozonized
turpentine, thereby utilizing it for the manufacture of half stuff and
paper, as with wood, straw, esparto, and other materials which have been
boiled with alkali.
Fig. 2 represents the cover of boiler.
Having thus described the nature and object of my said Invention I
declare that what I claim and desire to be secured to me by the herein-
before in part recited Letters Patent is, the improvements in the
manufacture of paper by employing tanners' spent bark, which is sus-
pended in a cage and boiled with certain other materials under steam
pressure in a boiler galvanized on the inside, being afterwards washed
and bleached, substantially as herein described and as referred to on the
accompanying Drawings or any mere modification thereof.
In witness whereof, I, the said Francis Richard Henry Protheroe,
have hereunto set my hand and seal, this Twenty-eighth day of
February, in the year of our Lord One thousand eight hundred
and seventy-three.
FRANCIS RICHARD HENRY PROTHEROE. (L.S.)