IMPROVEMENTS IN THE PREPARATION OF MATERIAL TO BE USED IN THE MANUFACTURE OF PORCELAIN AND POTTERY
Year: 1867

page_text: LETTERS PATENT to William Henry Kerr, of Clontarf, in the County of
Dublin, Ireland, China Merchant, for the Invention of "IMPROVEMENTS
IN THE PREPARATION OF MATERIAL TO BE USED IN THE MANUFACTURE OF
PORCELAIN AND POTTERY."
Sealed the 9th June 1868, and dated the 16th December 1867.
PROVISIONAL SPECIFICATION left by the said William Henry Kerr at
the Office of the Commissioners of Patents, with his Petition, on the
16th December 1867.
I, WILLIAM HENRY KERR, of Clontarf, in the County of Dublin, Ireland,
China Merchant, do hereby declare the nature of the said Invention for
"IMPROVEMENTS IN THE PREPARATION OF MATERIAL TO BE USED IN THE MANU-
FACTURE OF PORCELAIN AND POTTERY," to be as follows:-
This Invention relates to the preparation of all materials or compounds
used for the manufacture of porcelain and pottery by what is known as the
dry pressed system, that is to say, by the pressure of such materials into the
required shape in a dry state, and consists in the preliminary preparation of
such materials or compounds by calcining, or firing, or putting the same in
kilns or furnaces, or in any other convenient manner previous to such
materials being pressed into shape as above described.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Henry Kerr in the Great Seal Patent Office on the
16th June 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, WILLIAM
HENRY KERR, of Clontarf, in the County of Dublin, Ireland, China Manu-
facturer, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Sixteenth day of December, in the year of our
Lord One thousand eight hundred and sixty-seven, in the thirty-first year of
Her reign, did for Herself, Her heirs and successors, give and grant unto me,
the said William Henry Kerr, Her special license that 1, the said William
Henry Kerr, my executors, administrators, and assigns, or such others as I, the
said William Henry Kerr, my executors, administrators, or 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 "IMPROVE-
MENTS IN THE PREPARATION OF MATERIAL TO BE USED IN THE MANUFACTURE OF
PORCELAIN AND POTTERY," upon the condition (amongst others) that I, the
said William Henry Kerr, my executors or administrators, 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 bo
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 Henry Kerr, 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, that is to say :-
My said Invention relates to the preparation of all materials or compounds
used for the manufacture of porcelain and pottery by what is known as the
dry pressed system, that is to say, by the pressure of such materials into the
required shape in a dry state, and consists in the preparation of such materials
or compounds by calcining, or firing, or fretting the same in kilns or furnaces,
or in any other convenient manner, previous to such materials being pressed
into shape, as above described.
In practically carrying out my Invention I take any or all materials
intended to be used for the purpose herein-before referred to, and either before

page_text: or after (as occasion may require) grinding such materials I calcine or fret
them together or separately in articles called " saggers," which are are placed in
kilus or in what is generally known as Siemen's regenerative furnace, or in
any other furnace or kiln suitable for such purpose that will bear the action
of fire. The said materials after being so calcined or fretted are then to be
further ground or worked into a pulverised state for the purpose of pressure,
as above described, in suitable moulds or matrices, according to the shape of
the articles to be produced.
Having now described and particularly ascertained the nature of my said
Invention, and the manner in which the same is or may be used or carried
into effect, I would observe in conclusion that what I consider to be novel
and original, and therefore claim as the Invention secured to me by the herein-
before in part recited Letters Patent is, the calcining, firing, or fretting of the
materials to be used for the manufacture of porcelain and pottery by what is
known as the dry pressed systein.
In witness whereof, I, the said William Henry Kerr, have to this my
Specification set my hand and seal, the Tenth day of June, One thousand
eight hundred and sixty-eight.
WILLIAM HENRY KERK. (L.S.)