IMPROVEMENTS IN OR CONNECTED WITH STEAM BOILERS
Year: 1871

page_text: LETTERS PATENT to Bristow Hunt, of No. 1, Scrle Street, Lincoln's
Inn, in the County of Middlesex, Gentleman, for the Invention of
"IMPROVEMENTS IN OR CONNECTED WITH STEAM BOILERS."-A communica-
tion from abroad by James Stone, residing in Ceylon.
:
Sealed the 19th March 1872, and dated the 6th October 1871.
PROVISIONAL SPECIFICATION left by the said Bristow Hunt at the
Office of the Commissioners of Patents, with his Petition, on the
6th October 1871.
I, BRISTOW HUNT, of No. 1, Serle Street, Lincoln's Inn, in the County
5 of Middlesex, Gentleman, do hereby declare the nature of the said In-
vention for "IMPROVEMENTS IN OR CONNECTED WITH STEAM BOILERS,” (a com-
munication to me from abroad by James Stone, a person resident in
Ceylon) to be as follows:--

page_text: boiler not actually exposed to the action of the fire with a layer (of
suitable thickness) of pounded glass or other suitable non-conductor of
heat or electricity, which is held round the boiler in an outer casing of
thin sheet iron.
The glass is pounded in an iron mortar and passed through a sieve
having about ½ inch perforations; it should not exceed this size, but any
size smaller will do.
It may here be mentioned, firstly, that as some of the substitutes
for the pounded glass, sheets of glass may be sometimes employed as
well as pottery or china ware, flint, quartz, all resinous substances and
scaling wax; secondly, that in some cases it may not be necessary to
cover the whole of the portion of the boiler not exposed to the action of
the fire, as if the upper part of the same be covered with the non-
conducting material to about three inches below the lowest water line it
will be equally as effectual; and thirdly, that by the application of these
improvements to a steam boiler, and the adoption of the boiler so con-
structed, there will be a saving of nearly fifty per cent. in the consumption
of fuel
SPECIFICATION in pursuance of the conditions of the Letters Patent
filed by the said Bristow Hunt in the Great Seal Patent Office
on the 6th April 1872.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, BRISTOW
HUNT, of No. 1, Serle Street, Lincoln's Inn, in the County of Middlesex,
Gentleman, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Sixth day of October, in the year of
our Lord One thousand eight hundred and seventy-one, in the thirty-
fifth year of Her reign, did, for Herself, Her heirs and successors
give and grant unto me, the said Bristow Hunt, Her special licence
that I, the said Bristow Hunt, my executors, administrators, and
assigns, or such others as I, the said Bristow Hunt, 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

page_text: vend, within the United Kingdom of Great Britain and Ireland, the
Channel Islands, and Isle of Man, an Invention for "IMPROVEMENTS
IN OR CONNECTED WITH STEAK BOILERS," (a communication to me from
abroad by James Stone, a person resident in Ceylon) upon the condition
(amongst others) that I, the said Bristow Hunt, my executors or
administrators, by an instrument 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 Bristow Hunt, do hereby declare
the nature of the said Invention, and in what manner the same is
to be performed, to be particularly described and ascertained in and by
the following statement in writing (that is to say) :-
=
This Invention consists essentially in covering that part of the outside
of a steam boiler not actually exposed to the action of the fire with a
layer (of suitable thickness) of pounded glass or of other suitable non-
conductor or imperfect conductor of heat or electricity or of any
suitable combination thereof, which is held in position by an outer casing
of thin sheet iron, by which means the radiation of heat from the boiler
is retarded and the generation of steam therein thereby facilitated, and
the consumption of the fuel required for such purpose is materially
reduced, a saving therein being effected of about fifty per cent.
The glass or other material or combination of materials is or are
pounded in an iron mortar, or reduced by other suitable means, and
passed through a sieve having about quarter inch perforations; it is
preferred that the pieces should not exceed this size, but any size smaller
will answer the desired purpose. The materials may, if desired, be finely
pounded and mixed with clay or other adhesive material and laid on the
boiler as a cement, or the glass or other material may be mixed with
melted rosin, and laid on in that state, or cast in sheets to fit the boiler.
The thickness of the layer of the pounded glass or other material or
materials will in most cases be determined by the size or more par.
ticularly the requirements of the boiler to which it is to be applied, but
as a general rule it is found that if it is from one to two inches or there-
abouts in thickness, it will answer its purpose very effectually.

page_text: conductor or imperfect conductor of heat or electricity, or of any suitable
combination of such materials for the purpose of retarding the radiation
of heat from the boiler, so that the generation of steam therein is
facilitated, and the consumption of fuel required for such purpose is
materially reduced, substantially as herein-before described.
In witness whereof, I, the said Bristow Hunt, have hereunto set
my hand and seal, this Sixth day of April, in the. year of our
Lord One thousand eight hundred and seventy-two.