AN IMPROVEMENT IN. THE PROCESS OR BLEACHING MATERIALS FOR PADED MARING THE PROCESS AD BERACHING MATERIALE PAD DADED MARING " PROVISIONAL SPECIFICATION
Year: 1864

page_text: LETTERS PATENT to William Ibotson, of Wraysbury, in the County of
Buckingham, Paper Maker, for the Invention of "AN IMPROVEMENT IN.
THE PROCESS OR BLEACHING MATERIALS FOR PADED MARING
THE PROCESS AD BERACHING MATERIALE PAD
DADED MARING
"
PROVISIONAL SPECIFICATION left by the said William Ibotson at the
Office of the Commissioners of Patents, with his Petition, on the
25th January 1864.
I, WILLIAM IBOTSON, of Wraysbury; in the County of Buckingham, Paper
Maker, do hereby declare the nature of the said Invention for "AN IMPROVE-
MENT IN THE PROCESS OF BLEACHING MATERIALS FOR PAPER MAKING," to be as
follows:-
I place the materials reduced by the usual process to a state of "half-stuff,"
and closely pack them in moveable vats or cisterns of a convenient size and
shape, fitted with perforated or drainer bottoms, which vats I arrange one
above the other to the number of two or more, and allow bleaching agents in
a liquid form to percolate by gravitation through them all. From time to
time I remove the top vat when the stuff in it is fully or sufficiently bleached,
or at any rate before any unexhausted liquor has begun to penetrate through
the bottom vat, and raising the others sufficiently high I introduce another
vat of fresh stuff at the bottom.
My claim is for placing moveable vats one above the other in such a

page_text: position that the bleaching liquid may percolate through them successively
from top to bottom by their own gravity, the vats being so constructed and sup-
ported that their relative position may from time to time be altered as required.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Ibotson in the Great Seal Patent Office on the
25th July 1864.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
IBOTSON, of Wraysbury, in the County of Buckingham, Paper Maker, send
greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-fifth day of January, in the year of our Lord
One thousand eight hundred and sixty-four, in the twenty-seventh year of
Her reign, did, for Herself, Her heirs and successors, give and grant unto
me, the said William Ibotson, Her special licence that I, the said William
Ibotson, my executors, administrators, and assigns, or such others as I, the
said William Ibotson, my executors, administrators, and assigns, should at
any time agree with, and no others, from time to time and 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 "Ax IMPROVEMENT IN
THE PROCESS OF BLEACHING MATERIALS FOR PAPER MAKING,"
upon the condition
(amongst others) that I, the said William Ibotson, my executors or adminis-
trators, by an instrument in writing under ny, 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 William Ibotson, do hereby declare
the nature of my said Invention, and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement thereof, reference being had to the Drawings hereunto annexed,
that is to say:-
I place the materials reduced by the usual process to a state of "half-stuff,"
and closely pack them in movable vats or cisterns of a convenient size and
shape, fitted with perforated or drainer bottoms, which vats I arrange one
above the other to the number of two or more, and allow bleaching agents in

page_text: a liquid form to percolate by gravitation through them all. From time to
time I remove the top vat when the stuff in it is fully or sufficiently bleached,
or at any rate before any unexhausted liquor has begun to penetrate through
the bottom vat, and raising the others sufficiently high I introduce another.
vat of fresh stuff at the bottom.
The manner in which I carry the Invention into effect will be fully under-
stood by the accompanying Drawings and the following description.
a is the rag washer, from which the stuff is emptied down a pipe b; k is an
open box or pipe forming a movable top, which is made to fit into a flange or
offset at the top of tanks c, d, e, which tanks all have drainer bottoms; this
movable top being fitted into one of these tanks (say c), the stuff in the washer a,
when ready, is emptied into it, the water escapes through the drainer bottom,
and the stuff gradually subsides into the tank c, when the top k is sufficiently
raised, and the tank c is removed on a truck (n) in order that its contents
may undergo the bleaching process. By the above use of the movable top k
the tanks c, d, e, may be kept to a moderate size, say, 4 feet × 2 feet
6 inches x 2 feet. I is a ebain passing over a pulley m, which is fixed in a
travelling carriage or crane so arranged that any of the tanks c, d, e, may be
raised up by it and deposited on the engine room floor. The chain is attached
to the tanks by means of the flange or offset, and has two loops, so that it
may take hold of either one or two of the tanks as may be required. o is a
cock supplying bleaching liquor; p supplies water.
We will suppose the bleaching process completed as regards the tank f,
then the chain being set free from the tank e, the tank f is removed to the
engine room floor, where it is placed on a truck similar to n, and conveyed to
the beater. Then the chain is attached to the tanks e and d, which are
raised sufficiently to allow of the tank c being introduced below. c then takes
the place of d, and d of c, and e off; then the required quantity of bleach is
run through the cock o on to the surface of the stuff in the tank e, and
allowed to percolate downwards. When the top is dry or uncovered water
is run on through the cock p, and also allowed to percolate downwards until
all trace of bleach has been washed out of the tank (e) into the tanks below;
the stuff in the tank e is then finished, and it may be removed to the beating
engine. Tanks d and c are raised up and another introduced below, and the
process goes on continuously. g, h, and i are three other tanks, similar to
the tanks d, e, and f, and worked in a similar manner.
The tanks may be of cast or wrought iron, lined with lead if required, and
the drainer bottom may be made to advantage of slate strips about one inch
wide and inch deep, cut to a bevel, see the detached view q, and placed side

page_text: by side, with thin dividers of lead or copper between them. I prefer to form
the tanks oblong, with rounded corners.
And having now described the nature of the said Invention, and in what
manner the same is to be performed, I declare that I claim as my "Im-
provement in the Process of Bleaching Materials for Paper Making," the
employment of movable vats containing the material to be bleached placed
one above the other in such position that the bleaching liquids may percolate
through them successively from top to bottom by their own gravity, the vats
being so constructed and supported that their relative position may from time
to time be altered as required, all substantially as herein-before described.
In witness whereof, I, the said William Ibotson, have hereunto "set
my hand and seal, this Twenty-second day of July, One thousand
eight hundred and sixty-four.