AN IMPROVEMENT IN THE GLASSES OF RAILWAY CARRIAGE ROOF TAVEDO
Year: 1876

page_text: LETTERS PATENT to Henry Defries, of the Firm of Jonas Defries and Sons, of
No. 147, Houndsditch, London, in the County of Middlesex, Manufacturer, for the
Invention of "AN IMPROVEMENT IN THE GLASSES OF RAILWAY CARRIAGE ROOF
TAVEDO
Sealed the 1st December 1876, and dated the 6th June 1876.
PROVISIONAL SPECIFICATION left by the said Henry Defries at the Office of
the Commissioners of Patents on the 6th June 1876.
HENRY DEFRIES, of the Firm of Jonas Defries and Sons, of No. 147, Houndsditch,
"AN IMPROVEMENT IN THE
London, in the County of Middlesex, Manufacturer.
CLASSES OF RAILWAY CARRIAGE ROOF LAMPS."
When a railway carriage roof lamp is placed upon the ground its entire weight
is supported by the glass, and great expense and inconvenience result from the
breakage of the glass immediately under the rim or flange by which it is held to
the lamp when the lamp is put down or dropped so as to cause a slight concussion.
The object of my Invention is to obviate this defect, and I propose to effect
my purpose by moulding the lamp glass of an increased thickness below the rim or
flange; this increased thickness extending as far down the glass as I may in practice
find expedient.
I may obtain the increased thickness of my improved lamp glass either on the
outside or on the inside of the glass, or partly on the inside and partly on the out-
side, but in any case I propose to make it encircle the glass like a plain glass band
equally strong in its entire circumference, that is to say, having no weak point at
which the glass might break under concussion as aforesaid.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the
said Henry Defries in the Great Scal Patent Office on the 5th December
1876.
HENRY DEFRIES, of the Firm of Jonas Defries and Sons, of No. 147, Houndsditch,
"AN IMPROVEMENT IN THE
London, in the County of Middlesex, Manufacturer.
GLASSES OF RAILWAY CARRIAGE ROOF LAMPS."
When a railway carriage roof lanp is placed upon the ground its entire weight
is supported by the glass, and great expense and inconvenience result from the
Price 2d1

page_text: breakage of the glass immediately under the rim or flange, by which it is held
to the lamp when the lamp is put down or dropped so as to cause a slight con-
cussion.
The object of my Invention is to obviate this defect, and I effect my purpose by
moulding the lamp glass of an increased thickness below the rim or flange; this
increased thickness extending as far down the glass as I may in practice find
expedient.
I may obtain the increased thickness of my improved lamp glass either on the
outside or on the inside of the glass, or partly on the inside and partly on the out-
side, but in any case I propose to inake it encircle the glass like a plain glass band
equally strong in its entire circumference, that is to say, having no weak point at
which the glass might break under concussion as aforesaid.
In witness whereof, I, the said Henry Defries, have hereunto set my hand
and seal, this Fourth day of December, in the year of our Lord One thousand
eight hundred and seventy-six.
HENRY (L.S.) DEFRIES.