AN IMPROVEMENT IN PAPER-MAKING MACHINES
Year: 1860

page_text: LETTERS PATENT to Thomas Donkin, of the Firm of Bryan Donkin and
Company, of Bermondsey, in the County of Surrey, Engineers, for the
Sealed the 20th July 1860, and dated the 25th January 1860.
PROVISIONAL SPECIFICATION left by the said Thomas Donkin at the
Office of the Commissioners of Patents, with his Petition, on the 25th
January 1860.
I, THOMAS DONKIN, of the Firm of Bryan Donkin and Company, of Ber-
mondsey, in the County of Surrey, Engineers, do hereby declare the nature
of the said Invention for "AN IMPROVEMENT IN PAPER-MAKING MACHINES," to
be as follows:-
My Invention refers to that part of the paper-making machinery known as
the pulp knotter or strainer; it consists in making the plates thereof, in which
are the slits or apertures through which the pulp passes in a corrugated form,
whereby, among other advantages, cheapness, lightness, and strength are
secured. The knots or impurities fall into the bottom of the grooves between
the ridges, from whence they may be readily collected and removed.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by. the said Thomas Donkin in the Great Seal Patent Office on the
. 25th July 1860.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
DONKIN, of the Firm of Bryan Donkin and Company, of Bermondsey, in the
County of Surrey, Engineers, 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, in the twenty-third year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me, the
said Thomas Donkin, Her special licence that I, the said Thomas Donkin, my
executors, administrators, and assigns, or such others as I, the said Thomas
Donkin, 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 "AN IMPROVEMENT IN
PAPER-MAKING MACHINES," upon the condition (amongst others) that I, the
said Thomas Donkin, my executors or administrators, by an instrument in
writing under my, or their, or one of their hands and seals, should par-
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.
NOW KNOW YE, that I, the said Thomas Donkin, 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 :-
My Invention refers to that part of the paper-making machinery known as
the pulp knotter or strainer; it consists in making the plates thereof, in which
are the slits or apertures through which the pulp passes in a corrugated form,
whereby, among other advantages, cheapness, lightness, and strength are
secured. The knots or impurities fall into the bottom of the grooves between
the ridges, from whence they may be readily collected and removed.
Figure 1 of the accompanying Drawings is a plan of so much of a paper-
making machine as will be necessary to explain in what manner my Invention
may be conveniently carried into effect; Figure 2 is a section through the

page_text: line A, B, of Figure 1; and Figure 8 is a section through the line C, D, of
Figure 1. a is the pulp knotter or strainer; b, b, are the plates formed with
slits, as shewn. These plates are, by preference, corrugated into the form
shown at Figure 2. The knots or impurities fall into the spaces marked c, c,
included between the corrugations, and are easily removed therefrom.
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 the method of
forming the pulp knotter or strainer of paper-making machinery of a corru-
gated form, as herein-before described.
In witness whereof, I, the said Thomas Donkin, have hereunto set
my hand and seal, this Twenty-fifth day of July, One thousand eight
hundred and sixty.
THOMAS DONKIN.
(L.S.)