PRODUCING A NOVEL EFFECT OR APPEARANCE IN GLASS AND GLASS ARTICLES
Year: 1878

page_text: LETTERS PATENT to Sidney Adolphus Wittmann, of No. 42, Great Marlborough
Street, in the County of Middlesex, Glass Merchant, for the Invention of
"PRODUCING A NOVEL EFFECT OR APPEARANCE IN GLASS AND GLASS
ARTICLES."
Sealed the 1st November 1878, and dated the 30th August 1878.
PROVISIONAL SPECIFICATION left by the said Sidney Adolphus Wittmann
at the Office of the Commissioners of Patents on the 30th August 1878.
SIDNEY ADOLPHUS WITTMANN, of No. 42, Great Marlborough Street, in the
County of Middlesex, Glass Merchant. PRODUCING A NOVEL EFFECT OR APPEAR-
ANCE IN GLASS AND GLASS ARTICLES."
"
My Invention consists in producing an effect in glass similar to that produced by
the Chinese on china, and called "craquelé," which effect has hitherto never been
produced in glass.
In carrying my Invention into effect I proceed as follows:-The glass having
been fashioned by the glass-blower by any known means, and the form of the
article perfected, dip the said article in a liquid (preferably water), by which
means the "craquelé" effect is produced, the glass, when withdrawn from the water,
having the appearance of being covered with cracks, while it still retains its
integrity.
I am aware that "ice glass" or "frosted glass" has been made by dipping in
water the glass or article to be ornamented. My Invention, however, differs from
this process in that I dip the article after its form is perfected, by which time the
temperature of the glass has fallen sufficiently to allow of the " craquelé" effect
being produced, whereas in producing the aforesaid "ice" or "frosted" effect the
glass is dipped repeatedly during the formation of the article and while the glass is
in a malleable state.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Sidney Adolphus Wittmann in the Great Seal Patent Office on the
26th February 1879.
SIDNEY ADOLPHUS WITTMANN, of No. 42, Great Marlborough Street, in the
County of Middlesex, Glass Merchant. PRODUCING A NOVEL EFFECT OR APPEAR-
ANCE IN GLASS AND GLASS ARTICLES."
"
My Invention consists in producing an effect in glass similar to that produced by
the Chinese on china, and termed "craquelé," which effect has hitherto never been
produed in glass.
In carrying my Invention into effect I proceed as follows:-The glass having
been fashioned by blowing or any other known means, and the form of the article
having been perfected, I immediately dip the said article in a liquid (preferably
water), by which means the "craquelé" effect is produced, the glass, when withdrawn
from the water, having the appearance of being covered with cracks, while it still
retains its integrity.
The glass must be rapidly dipped and withdrawn, and if after the first dipping
the "craquelé" effect is not apparent the glass must be again dipped when it has
cooled a little.
I am aware that "ice glass" or "frosted glass" has been made by dipping in
water the glass or article. to be ornamented. My Invention, however, differs from
this process in that I dip the article after its form is perfected, when the temperature
of the glass has fallen sufficiently to allow of the "craquelé" effect being produced,
whereas in producing the aforesaid "ice" or "frosted" effect the glass is dipped
repeatedly during the formation of the article and while the glass is in a malleable
state.
Having now described the nature of my Invention, and the manner in which it
is to be performed, I claim as my said Invention producing the "cruquelé" effect
in glass by dipping it after the form has been perfected, and while the glass is still
-hot,-in water-or other suitable liquid, essentially as-herein-before described.
In witness whereof, I, the said Sidney Adolphus Wittmann, have hereunto set
my hand and seal, this Twenty-sixth day of February, in the year of our
Lord One thousand eight hundred and seventy-nine.
S. A. WITTMANN. (L.S.)