AN IMPROVED PROCESS OF METALLIZING GLASS-WARE
Year: 1878

page_text: LETTERS PATENT to Alexander Melville Clark, of Chancery Lane, in the
County of Middlesex, Patent Agent, for the Invention of "AN IMPROVED
PROCESS OF METALLIZING GLASS-WARE." A communication from abroad by
Messieurs Monot, père et fils, and Stumpf, of Paris, France.
Sealed the 20th May 1879, and dated the 29th November 1878.
PROVISIONAL SPECIFICATION left by the said Alexander Melville Clark at
the Office of the Commissioners of Patents on the 29th November 1878.
ALEXANDER MELVILLE CLARK, of Chancery Lane, in the County of Middlesex,
Patent Agent. "AN IMPROVED PROCESS OF METALLIZING GLASS-WARE." [A com-
munication from abroad by Messieurs Monot, père et fils, and Stumpf, of Paris,
France.]
This Invention relates to an improved process of metallizing crystal or glassware
in the course of manufacture.
The Invention consists in the use of a suitable reducing gas, such as pure hydrogen
gas or coal gas instead of the air or vapour by which glass is now blown in moulding
it or shaping it by hand; the employment of a reducing gas in this way has for its
object to reduce the metallic oxides or salts added in the composition of the glass,
and thus to metallize the goods on the interior of any shade or color according to
the composition of the glass.
This metallizing process may be applied in the manufacture of all kinds of glass-
whether for decorative or useful purposes, including reflectors and other glass
work used in lighthouses and for lighting apparatus generally.
ware,

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Alexander Melville Clark in the Great Seal Patent Office on the 29th
May 1879.
ALEXANDER MELVILLE CLARK, of Chancery Lane, in the County of Middlesex,
Patent Agent.
"AN IMPROVED PROCESS OF METALLIZING GLASSWARE." A com-
munication from abroad by Messieurs Monot, père et fils, and Stumpf, of Paris,
France.
This Invention relates to an improved process of metallizing crystal and other
glass ware in the course of its manufacture.
The Invention consists in the employment, instead of the air or vapor by which
glass is now blown in the process of moulding it or of shaping it by hand, of a
suitable reducing gas, such as pure hydrogen gas or coal gas for the purpose of
reducing metallic oxides or salts added in the composition of the glass, and thereby
metallizing the interior surface of the glass. This may be done of all shades or
colors according to the composition of the glass. The oxides may be any of those
generally used in glass working, for instance, oxides of copper, which when reduced
as above mentioned impart a golden or bronzed aspect to the glass.
This metallizing process may be applied not only in the manufacture of all kinds
of articles of glass or crystal, but also to stained window glass, glass plaques, or tiles
for mural or other decoration, reflectors, lighthouse lenses, and glass used in lighting
apparatus generally.
Having described the nature of the Invention, and the manner of performing the
same, I declare that what I claim as the Invention to be protected by the herein-
before in part recited Letters Patent is,―
-
The process of metallizing crystal and other glass ware consisting in the employ-
ment of a reducing gas (instead of air or vapor) for blowing the glass, whereby
metallic oxides or salts contained in the glass are reduced as specified.
In witness whereof, I, the said Alexander Melville Clark, have hereunto set
my hand and seal, this Twenty ninth day of May, in the year of our Lord
One thousand eight hundred and seventy nine.