Improvements in the Manufacture of Glass Shades for Gas Burners and such like.
Year: 1889

page_text: Date of Application, 22nd May, 1889
Complete Specification Left, 19th Feb., 1890-Accepted. 29th Mar.
1890
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Glass Shades for Gas Burners
and such like.
I, THOMAS DAVIDSON, of Teams Flint Glass Works, Gateshead-on-Tyne, in the
County of Durham, Glass Manufacturer, do hereby declare the nature of this invention
to be as follows:
1
The object of this invention is to manufacture glass shades of pressed glass and to
make them lighter than heretofore practicable.
To form a shade I first make in pressed glass a short cylinder with dome end and
with a hole of comparatively small diameter through the centre of the dome.
When taken from the mould the dome end whilst kept in a soft state by the
application of heat is rotated so as to cause it to open out and expand until the hole in
the centre of the dome is enlarged to a diameter greater than the opposite end of the
cylinder and until the end is thereby brought to a bell mouthed form-whilst the
enlarged end is still soft it is placed vertically on to a mould which supports it at
various points around its circumference and leaves it unsupported at others so allow-
ing these parts to droop inwards-the mould may conveniently be of rods standing
up in a circle at distances apart and made to incline inwards one towards the
other.
Where the glass rests upon and is supported by the wires it is retained in its
original bell mouth form-whilst in between the wires it droops downwards and so
the edge becomes hent into a number of flutes or corrugations.
By first making a cylinder with a dome end in pressed glass and subsequently
expanding out this end and moulding it to the form required-much lighter shades
can be made of pressed glass than if the glass were in the first place pressed to the
diameter required.
Doted th: 00-1 1
1000
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Glass Shades for Gas Burners
and such like.
I, THOMAS DAVIDSON, of Teams Flint Glass Works, Gateshead-on-Tyne, in the
County of Durham, Glass Manufacturer, do hereby declare the nature of this inven-
tion and in what manner the same is to be performed to be particularly described
and ascertained in and by the following statement:-
The object of this invention is to manufacture glass shades of pressed glass and to
make them lighter than heretofore practicable.
To form a shade I first make in pressed glass a short cylinder with dome end and
with a hole of comparatively small diameter through the centre of the dome.
When taken from the mould the dome end whilst kept in a soft state by the
application of heat is rotated so as to cause it to open out and expand until the hole
in the centre of the dome is enlarged to a diameter greater than the opposite end of
the cylinder and until the end is thereby brought to a bell mouthed or other desired
form whilst the enlarged end is still soft it is placed vertically on to a shape which
supports it at various points around its circumference and leaves it unsupported at
others so allowing these parts to droop inwards the shape may conveniently be of
rods standing up in a circle at distances apart and made to incline inwards one
towards the other.

page_text: Where the glass rests upon and is supported by the wires it is retained in its original
bell mouth form-whilst in between the wires it droops downwards and so the edge
becomes bent into a number of flutes or corrugations.
By first making a cylinder with a dome end in pressed glass and subsequently
expanding out this end and shaping it to the form required-much lighter shades
can be made of pressed glass than if the glass were in the first place pressed to the
diameter required.
The drawing annexed show the various stages by which a dome ended cylinder of
pressed glass is formed into a glass shade as above described.
Figure 1 is a vertical section and Figure 2 a side elevation of one of the dome
ended cylinders of the form in which it is removed from the mould. When removed
its larger end is first heated so as to make the edge perfectly smooth-and at the
same time the cylindrical sides just above this edge are slightly bulged as shown at
Figures 3 and 4 by means of an ordinary glass making tool, the cylinder being held
by a punty or rod commonly used in making glass.
The opposite end is now heated by exposure to fire and the cylinder is rotated to
cause its dome end to enlarge until it comes say to the form shown in side elevation
at Figure 5 the shade being secured on a punty as used in glass making.
When this has been done the shade whilst the expanded end is still hot is inverted
and placed over an assemblage of curved rods or supports as shown at Figure 6 and
in this way as above explained the expanded end is made into waves or corrugations
as shown at Figure 7 or any other desired shape.
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. The manufacture of glass shades for gas burners and such like by first making a
cylinder with dome end in pressed glass and subsequently expanding this end
substantially as described.
2. The manufacture of glass shades for gas burners and such like substantially in
the manner herein before described.
Dated this 14th dort of Fahr 1800