IMPROVEMENTS IN THE PRODUCTION OF GLAZED OR ENAMELLED MATERIALS
Year: 1879

page_text: LETTERS PATENT to John Henry Johnson, of 47, Lincoln's Inn Fields, in the
County of Middlesex, Gentleman, for the Invention of "IMPROVEMENTS IN
THE PRODUCTION OF GLAZED OR ENAMELLED MATERIALS." A communication
from abroad by André Gouault, of Paris, in the Republic of France.
Sealed the 29th August 1879, and dated the 15th April 1879.
PROVISIONAL SPECIFICATION left by the said John Henry Johnson at the
Office of the Commissioners, of Patents on the 15th April 1879.
JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middlesex,
Gentleman, "IMPROVEMENTS IN THE PRODUCTION OF GLAZED OR ENAMELLED
MATERIALS." A communication from abroad by André Gouault, of Paris, in the
Republic of France.
This Invention relates to the employment, as a solid ground work or base for the
application of coatings of glaze or enamel obtained by the ordinary processes of
natural sandstones in general, and especially of those sandstones more nearly related
to those varieties known as natural white sandstone and natural red sandstone of
the Vosges.
These natural sandstones possess the double property of being capable of being
cut up, carved, turned, sculptured, and otherwise treated with facility, and of being
submitted to a very elevated temperature without the liability of becoming distorted
in shape or cracked.
In carrying out this Invention articles of any required shape formed of natural
sandstone are submitted to a process of glazing or enamelling in any colour, and
either plain or in any style of decoration, such glazing or enamelling being per-
formed in the same manner as when treating articles of china or pottery.
By this means enamelled natural sandstone is obtained, constituting a novel
industrial product, and which being capable of being made in any form or shade
will be adapted to a great variety of applications, such, for example, as the internal
and external decorations of houses, buildings, and monuments, linings or ornamental
casings for stoves, furnaces, and chimney pieces. Balustrades, pillars of stair cases,
balconies, gutter stones, and the like; plates, panels, or squares manufactured
according to this Invention may also be employed for covering either the floor or
the sides of ovens, and will not be liable to injury from excessive heat.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Henry Johnson in the Great Seal Patent Office on the 6th
October 1879.
$$
the County of Middlesex,
GLAZED OR ENAMELLED
JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in
Gentleman. IMPROVEMENTS IN THE PRODUCTION OF
MATERIALS." A communication from abroad by André Gouault, of Paris, in the
Republic of France.
The said Invention relates to the employment, as a solid ground work or base
for the application of coatings, of glaze or enamel obtained by the ordinary processes
of natural sandstones in general, and especially of those sandstones more nearly
related to the varieties known as natural white sandstone and natural red sand-
stone of the Vosges.
These natural sandstones possess the double property of a capability of being cut
up, carved, sculptured, and otherwise treated with facility, and of being submitted
to a very elevated temperature without the liability of becoming distorted in
shape or cracked.
In carrying out the said Invention articles of any required shape formed of
natural sandstone are submitted to a process of glazing or enamelling in any
required colour, and either plain or in any desired style of decoration, such glazing
or enamelling being performed in the same manner as when treating articles of
china or pottery.
By this means enamelled natural sandstone is obtained constituting a novel
industrial product, and which as it is capable of being made in any form or shade
will be adapted to a great variety of applications, such for example, as the internal
and external decorations of houses, buildings, and monuments, linings or ornamental
casings for stoves, furnaces, and chimney pieces, balustrades, pillars of staircases,
balconies, gutter stones, and the like; plates, panels, or squares manufactured
according to the said Invention may also be employed for covering either the floor
or the sides of ovens, and will not be liable to injury from excessive heat.
Having now described and particularly ascertained the nature of the 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 hereinbefore in
part recited Letters Patent is,---
The employment in the production of glazed or enamelled materials of natural
sandstones as a base for a coating of plain or decorated glaze or enamel, sub-|
stantially as herein before described.
In witness whereof, I, the said John Henry Johnson, have to this my Specifica-
tion set my hand and seal, this Third day of October, One thousand eight
hundred and seventy nine.