IMPROVEMENTS IN THE PRE- PARATION OF MATERIALS TO BE USED IN THE MANUFACTURE OF PORCELAIN AND POTTERY
Year: 1877

page_text: LETTERS PATENT to William Henry Kerr, of Malahide, in the County of
Dublin, Ireland, Esquire, for the Invention of "IMPROVEMENTS IN THE PRE-
PARATION OF MATERIALS TO BE USED IN THE MANUFACTURE OF PORCELAIN
AND POTTERY."
Sealed the 11th December 1877, and dated the 30th June 1877.
PROVISIONAL SPECIFICATION left by the said William Henry Kerr.at
the Office of the Commissioners of Patents on the 30th June 1877.
WILLIAM HENRY KERR, of Malahide, in the County of Dublin, Ireland, Esquire.
"IMPROVEMENTS IN THE PREPARATION OF MATERIALS ΤΟ BE USED IN
MANUFACTURE OF PORCELAIN AND POTTERY."
THE
My said Invention relates to the preparation of materials used for the manufacture
of porcelain and pottery.
In carrying out my Invention, I first take the raw materials to be employed, and
fire or fret each of such materials separately. I then grind and mix together such
materials, and then subject the materials so ground and mixed to the action of heat
in any convenient furnace. The materials are then again ground, and so prepared
for manufacture in moulds for the objects required, or the said material prepared as
above may be fused as in a glass furnace, and when under the action of heat may
be blown into forins or run into moulds, as is well known.

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 28th
December 1877.
WILLIAM HENRY KERR, of Malahide, in the County of Dublin, Ireland, Esquire.
"IMPROVEMENTS IN THE PREPARATION OF MATERIALS TO BE USED IN
MANUFACTURE OF PORCELAIN AND POTTERY."
THE
My said Invention relates to the preparation of materials used for the manufacture
of porcelain and pottery, and is especially adapted for use in the manufacture of
telegraph insulators.
In carrying out my said Invention, I first take the raw materials to be employed,
and fire or fret each of such materials separately. I then grind and mix together
such materials, and then subject the materials so ground and mixed to the action of
heat in any convenient furnace. The materials are then again ground, and so
prepared for manufacture for the production of telegraph insulators or other articles,
which manufacture may be carried on either by subjecting the material to pressure
by mechanical means, or casting in moulds in a liquid state, or dried, and thrown,
and turned. Or further, the said material (prepared as above) may be fused in a
glass furnace, and while under the action of heat may be blown into forms, such as
insulators or other articles, or run into moulds, as is well known.
In cases where only one material, such as felspar, is used, the second firing may
be dispensed with, after being ground previous to its being employed in the manu-
facture of articles in pottery, either by the process called dry pressure, casting in
plaster, or any other moulds, either wet or dry, or throwing, or turning, or any
other process of potting.
I would here observe that the process herein described for the preparation of
materials to be used in the manufacture of porcelain and pottery is of essential
importance in the production of insulators for telegraphic purposes of a more perfect
quality, and in a more simple, expeditious, and economical manner than by any
known process hitherto in use. For example, according to the present process of
manufacturing telegraphic insulators, the article when formed is subjected to two
firings, first in a biscuit kiln, and secondly, in a glost oven, whereas by my process
as herein described of preparing materials for said manufacture, the said articles can
be produced fit for use by one kiln fire alone, and without dipping in any glaze.
Having thus described the nature of my said Invention I would have it under-
stood that what I consider to be novel and useful, and therefore claim as the
Invention secured to me by the herein-before in part recited Letters Patent is, the
method, substantially as herein described, of preparing materials used in the manu-
facture of porcelain and pottery.
"In witness whereof, I, the said William Henry Kerr, have unto this my
Specification set my hand and seal, this Twenty-seventh day of December,
in the year of our Lord One thousand eight hundred and seventy-seven.