IMPROVEMENTS IN GLASS FURNACES
Year: 1868

page_text: LETTERS PATENT to Thomas Warren, of Glasgow, in the County of
Lanark, North Britain, Glass Manufacturer, for the Invention of
"IMPROVEMENTS IN GLASS FURNACES."
Sealed the 22nd June 1869, and dated the 24th December 1868.
PROVISIONAL SPECIFICATION left by the said Thomas Warren at
the Office of the Commissioners of Patents, with his Petition, on
the 24th December 1868.
I, THOMAS WARREN, of Glasgow, in the County of Lanark, North
Britain, Glass Manufacturer, do hereby declare the nature of the said
Invention for "IMPROVEMENTS IN GLABS FURNACES," to be as follows:-
This Invention relates to improvements: to be used in combination
with those described in the Specification of Letters Patent granted to
the present applicant, and dated 6th May 1868, No. 1480, but also
applicable otherwise; and it consists, firstly, in making the sides of the
melting tank of solid brickwork instead of with open air spaces; it also
consists, secondly, in making the furnaces or fuel chambers with the
outer parts of their roofs considerably lower than the inner parts, so as

page_text: to reduce the furnace space, and thereby prevent the premature
expansion of the gases therein; and it consists, thirdly, in forming
a thin air flue under the passage leading from each furnace to the
tank, air being admitted to such flue from the heating flues below and
passing on to the air inlets into the tank.
SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Thomas Warren in the Great Seal Patent Office
on the 23rd June 1869.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
WARREN, of Glasgow, in the County of Lanark, North Britain, Glass
Manufacturer, send grecting.
WHEREAS Пer most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-fourth day of December, in
the year of our Lord One thousand eight hundred and sixty-eight, in
the thirty-second year of Her reign, did, for Herself, Her heirs and
successors, give and grant unto me, the said Thomas Warren, Her
special licence that I, the said Thomas Warren, my executors, adminis-
trators, and assigns, or such others as I, the said Thomas Warren,
my executors, administrators, and assigns, should at any time agree
with, and no others, from time to time and at all times thereafter
during the term therein expressed, should and lawfully might make,
use, exercise, and vend, within the United Kingdom of Great Britain
and Ireland, the Channel Islands, and Isle of Man, an Invention for
"IMPROVEMENTS IN GLASS FURNACES," upon the condition (amongst others)
that I, the said Thomas Warren, my executors or administrators, by
an instamment in writing under my, or their, or one of their hands
and seals, should particularly describe and ascertain the nature of the
said Invention, and in what manner the same was to be performed,
and cause the same to be filed in the Great Seal Patent Office within
six calendar months next and immediately after the date of the said
Letters Patent.
NOW KNOW YE, that I, the said Thomas Warren, do hereby declare
the nature of my said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and

page_text: by the following statement in writing, reference being had to the
accompanying Drawings, that is to say :-
My said Invention relates to improvements to be used in combination
with those described in the Specification of certain earlier Letters Patent
granted to me, and dated 6th May 1868 (No. 1480), but also applicable
otherwise; and it consists, firstly, in making the sides of the melting
tank of solid brickwork; secondly, in making the furnaces with the
outer parts of their roofs considerably lower than at the inner end; and
thirdly, in forming a thin air flue under the passage or throat leading
from each furnace to the tank, air being admitted to such flue from
the heating flues below, and continuing on to the air inlets into the
tank.
And in order that my said Invention and the manner of performing
the same may be properly understood I have hereunto appended a
Sheet of explanatory Drawings to be herein-after referred to, and repre-
senting the application of my present improvements to glass furnaces
constructed in other respects as described in my carlier Specification
herein-before referred to.
Figures 1 and 2 are vertical sections at right angles to cach other;
and Figure 3 is a horizontal section, one half at the level of the tank
and the other half at that of the uppermost of the series of air flues.
The parts which are the same as those described in my earlier Specifi-
cation are marked with the same reference numerals and letters, and
require no detailed description in he present instrument.
The air spaces 8 beneath the ank 1 are retained, but the sides 21
of the tank are composed of solid brickwork. The furnaces or fuel
chambers 9 are built with the outer parts 22 of their roofs considerably
lower than the inner parts 23, so as to reduce the furnace space, and
thereby prevent the premature expansion and complete ignition of the
gases therein. The arrangement of flues (a to f) is retained for utilising
the heat of the waste fire gases, to heat air introduced into the tank 1,
to complete the ignition of the gases in the tank, but the air partially
heated in this way is led up by vertical flues 15 on both sides of each
ash-pit into thin spaces or flues 24 under each furnace throat 10. The
air in the spaces 24 is still capable of absorbing heat from the brickwork,
so as to prevent the bottoms of the throats 10 from becoming overheated.
From the spaces 24 the air passes by flues 25 into the tank, these flues

page_text: being constructed so as to direct the air towards the centre of the
tank 1.
Having thus particularly described my said Invention, and the
manner in which the same is to be performed, I have to state that
what I believe to be novel and original, and claim as the Invention
secured to me by the herein-before in part recited Letters Patent is,
the application of the improvements herein-before described to glass
furnaces constructed as described in my earlier Specification or in
substantially the same manner.
In witness whereof, I, the said Thomas Warren, have hereunto
set my hand and seal, this Twenty-second day of June, in the
year of our Lord One thousand eight hundred and sixty-nine..
THOMAS WARREN. (L.S.)