AN IMPROVEMENT IN THE MANUFACTURE OF GLASS
Year: 1888

page_text: Date of Application, 17th May, 1888
Complete Specification Left, 16th Feb., 1889
Complete Specification Accepted, 16th Mar., 1889
JOHN THOMAS HADEN RICHARDSON Glass Manufacturer Hatton near Burton on
Trent do hereby declare the nature of my invention for "AN IMPROVEMENT IN THE
MANUFACTURE OF GLASS" to be as follows:-
The invention relates to the hardening of Flint or other Glass during the process of
manufacture by an induced current or currents of cold or refrigerated air or Gas or
by sudden immersion into a refrigerated air or Gas Chamber for the purpose of
hardening or suddenly contracting the surfaces of the Glass operated upon.

page_text: I JOHN THOMAS HADEN RICHARDSON, of Hatton, in the County of Derby, Glass
Manufacturer, do hereby declare the nature of this invention, and in what manner
the same is to be performed, to be particularly described and ascertained in and
by the following statement:-
This invention relates to an improvement in the manufacture of glass and it consists
in hardening or toughening articles of flint or other glass during the process of manu-
facture by submitting them to the effect of an induced current or currents of cold or
refrigerated air or gas, or by suddenly introducing them into a refrigerating air or
gas chamber, whereby the surfaces of the glass operated upon are suddenly contracted
and the glass thus hardened or toughened.
I have not deemed it necessary to illustrate the application of my process by a
drawing inasmuch that the apparatus used presents no features of novelty and that the
application of my invention will be readily understood by any glass manufacturer.
A very simple method of applying my process is to connect the chamber which is
to receive the article to be hardened or toughened with a blower from which a current
or currents of cold air, produced by a steam jet or otherwise, may be directed upon
the article, the chamber being provided with suitable inlet and outlet pipes to the
blower.
The article when near a melting state (soft or flexible), is taken from the glass
blower, and placed in the air chamber, a current of cold air is then sent upon it during
a few seconds, and it is then removed to the ordinary annealing oven or lear.
Or the article may be placed in its heated and soft state in a refrigerating chamber
of any suitable kind remaining there for a few seconds and then be passed to the
annealing oven.
The time during which the glass is submitied to the cold blast or to the refrigerating
chamber will be regulated by the thickness and form of the article.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
:―
1. In the manufacture of glass, submitting it in a partially melted condition, as it
leaves the blower, to an induced current or currents of cold air or gas and afterwards
annealing, substantially as and for the purpose specified.
2. In the manufacture of glass, introducing it while in a partially melted condition,
as it leaves the blower, into a cold air or gas chamber and afterwards annealing,
substantially as and for the purpose specified.
3. The improvement in the manufacture of glass hereinbefore described.
Dated this Sixteenth
1000