An Improved Method of Cutting or Dividing Glass Cylinders and other Forms or Articles of Glassware.
Year: 1889

page_text: Date of Application, 23rd Dec., 1889
Complete Specification Left, 23rd Sept.. 1890-Accepted. 1st Nov.. 1890
PROVISIONAL SPECIFICATION.
An Improved Method of Cutting or Dividing Glass Cylinders and
other Forms or Articles of Glassware.
I JOHN GEORGE SOWERBY, of Sowerby's Ellison Glass Works Limited, Gateshead-
on-Tyne, in the County of Durham, Glass Manufacturer, do hereby declare the nature
of this invention to be as follows:-
This invention relates to an improved method of cutting or dividing glass cylinders
and other forms or articles of glassware and it consists essentially in an application of
electricity to this purpose.
Around the outside of the glass cylinder or other article of glassware I place a
platinum or other wire or suitable conductor of electricity through which I pass an
electric current, obtained from any suitable source, until the portion of the glass in
contact with the wire becomes so heated that fracture or division of the glass takes
place at that point.
Dated this Twenty-third day of December 1889.
COMPLETE SPECIFICATION.
An Improved Method of Cutting or Dividing Glass Cylinders and
other Forms or Articles of Glassware.
I JOHN GEORGE SOWERBY, of Sowerby's Ellison Glass Works Limited, Gateshead-
on-Tyne, in the County of Durham, Glass Manufacturer, do hereby declare the nature
of this invention and in what manner the sanio is to be performed, to be particularly
described and ascertained in and by the following statement :-
This invention relates to an improved method of cutting or dividing glass cylinders
and other forms or articles of glassware and it consists essentially in an application of
electricity to this purpose.
The accompanying drawing represents a longitudinal section through a lathe or
headstock adapted for the purpose of my invention.
A being the inthe or headstock,
B is a hollow mandrel arranged to revolve in the bearings C,
D metal chuck or case,
E cap or face of chuck; this cap may be of slate or any suitable non-conducting
matorial.
F lining for chuck, which may be of cork or other suitable elastic material.
G wire for passage of electric current in dividing tumbler H, or other article of
glassware; this wire may be of platinum, or any suitable conductor of electricity may
be used in connection with a dynamo or any suitable source of electricity- point at
which the tumbler is divided.

page_text: in contact with the wire becomes so heated that fracture or division of the glass takes
place at the point h.
I desire it to be understood that I do not limit myself to the particular arrangement
of machinery or apparatus illustrated on the drawing as such may be varied while
retaining the essential feature of my invention.
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 :-
The application of electricity to the cutting or dividing of glass cylinders and other
forms or articles of glassware substantially as hereinbefore described and illustrated on
the accompanying drawing.
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