Improved Means for Smoothing or Polishing Cylinder or Sheet Glass in the Process of Flattening.
Year: 1893

page_text: Date of Application, 16th Sept.. 1893
Complete Specification Left, 14th June, 1894-Accepted, 15th Sept., 1894
PROVISIONAL SPECIFICATION.
Improved Means for Smoothing or Polishing Cylinder or Sheet
Glass in the Process of Flattening.
We, ANTHONY DIXON BROGAN and ANDREW MURRAY MALLOCH sole
partners of The Glasgow Plate Glass Company, Firhill, Glasgow, Lanarkshire,
Glass Manufacturers, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object the provision of improved means to be used in
substitution for the ordinary wooden polissoir for smoothing or polishing cylinder
or sheet glass in the process of flattening and it consists in the employment of a
box of metal or other non-combustible material through which gas or powdered
combustible matter is led being preferably passed through orifices in the bottom
so as to serve as a lubricant between the soft glass and the box which is traversed
over the glass by means of a suitable handle.
The box may be made flat or of cylindrical or other form. In lieu of a box a
flat plate may be used under or through which combustible powdered material is
led to serve as a lubricant.
Oil, grease, resin or other hydrocarbon may be used as the lubricant instead of
the gas or powdered material.
Dated this 15th day of September 1893.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.
COMPLETE SPECIFICATION.
Improved Means for Smoothing or Polishing Cylinder or Sheet
Glass in the Process of Flattening.
We, ANTHONY DIXON BROGAN and ANDREW MURRAY MALLOCH, sole
partners of The Glasgow Plate Glass Company, Firhill, Glasgow, Lanarkshire,
Glass Manufacturers, 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 has for its object the provision of improved means to be used in
substitution for the ordinary wooden polissoir for smoothing or polishing cylinder
or sheet glass in the process of flattening and it consists in the employment of a
box of metal or other non-combustible material through which gas or powdered
combustible matter is led being preferably passed through orifices in the bottom
so as to serve as a lubricant between the soft glass and the box which is traversed
over the glass by means of a suitable handle.
The box may be made flat or of cylindrical or other form. In lieu of a box a
flat plate may be used under or through which combustible powdered material is
led to serve as a lubricant. Oil, grease, resin or other hydrocarbon may be used
as the lubricant instead of the gas or powdered material.
In the accompanying drawings which in part illustrate the invention Figure 1
is a side elevation of the improved polissuir in the form of a flat metal plate,
Figure 2 is a plan of the same, and Figure 3 is a side elevation of a modification
in which a box is substituted for the plate. The plate A has jointed or otherwise

page_text: attached to it a handle or shaft B of any suitable form by means of which it is
traversed to and fro over the surface of the glass whilst the powdered or other
lubricant is scattered over the glass or passed through orifices a in the plate.
The lubricant which assumes the gaseous form under the action of heat prevents
harsh rubbing contact of the plate such as would result in scratching the surface
of the glass.
When the improved polissoir is made in the form of a box as represented
at A Figure 3 the lubricant such as powdered carbonaceous matter or hydro-
carbon is placed within the box and passes through orifices a in the bottom, or if
a gaseous lubricant be used it may be led or forced through a flexible tube
leading into the box as indicated at C Figure 3 and through the bottom of which
it passes.
Having now particularly described and ascertained the nature of our said inven-
tion, and in what manner the same is to be performed, we declare that what we
claim is
1. As means for smoothing or polishing cylinder or sheet glass, a polissoir
composed of a flat metal plate or box in conjunction with the use of a lubricant
conveyed between the plate and the surface of the glass, substantially as described.
2. A polissoir for smoothing or polishing cylinder or sheet glass, composed of
a flat plate or box having perforations in the bottom for the passage therethrough
of a solid or fluid lubricant, substantially as described.
Dated this 13th day of June 1894.
CRUIKSHANK & FAIRWEATHER,
62, St. Vincent Street, Glasgow, Agents.