IMPROVE- MENTS IN TUYERES FOR BLAST FURNACES AND OTHER PURPOSES
Year: 1867

page_text: LETTERS PATENT to William Barrett, of Norton, in the County of Durham,
Ironmaster, and Charles Martin, of Chancery Lane, in the County of
Middlesex, Civil Engineer, for the Invention of "IMPROVEMENTS IN
PROVISIONAL SPECIFICATION left by the said William Barrett and
Charles Martin at the Office of the Commissioners of Patents, with their
Petition, on the 21st October 1867.
We, WILLIAM BARRETT, of Norton, in the County of Durham, Ironmaster,
and CHARLES MARTIN, of Chancery Lane, in the County of Middlesex, Civil
Engineer, do hereby declare the nature of the said Invention for "IMPROVE-
MENTS IN TUYERES FOR BLAST FURNACES AND OTHER PURPOSES," to be as
follows:-
This Invention has for its object the construction of tuyeres which will
possess greater durability than tuyeres as hitherto constructed, and which will
also be free from some important objections and disadvantages which have
attached thereto.
Furnace tuyeres as previously constructed have depended for their pre-
servation upon the supply of water to the nozzles by the ordinary and
well-known means; practically, however, it has been found that the head of
water necessary for this purpose is frequently not attainable, or that from
other causes it does not flow in sufficient quantity through the coil of pipe of

page_text: which the tuyere is made, and that consequently the nozzle is burnt through
by the heat of the furnace, the water being discharged upon the molten con-
tents, the result being that the working of the furnace has been affected and
serious explosions frequently caused.
In order to avoid these objections tuyeres constructed in accordance with
this Invention are constructed of heavy tubing, such as is used for Perkins's
well-known hot water apparatus, the same being made into a coil of the
desired size. The flow and return are connected, and a sufficient length of
pipe, in coil or otherwise, employed, which may be placed in a cistern of water
for more speedily cooling the water with which the pipes are charged. It is
preferable to use distilled water for charging the pipes in order to prevent
incrustation, which would impede the flow. In charging the pipes sufficient
space should be left for expansion, and as the water from time to time becomes
reduced in quantity a fresh supply is given by a two-way cock which is
attached to a pipe carried up from the flow at the highest elevation.
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said William Barrett and Charles Martin in the Great Seal Patent
Office on the 20th April 1868.
TO ALL TO WHOM THESE PRESENTS SHALL COME, we, WILLIAM
BARRETT, of Norton, in the County of Durham, Ironmaster, and CHARLES
MARTIN, of Chancery Lane, in the County of Middlesex, Civil Engineer,
send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-first day of October, in the year of our Lord
One thousand eight hundred and sixty-seven, in the thirty-first year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto us,
the said William Barrett and Charles Martin, Her special licence that we,
the said William Barrett and Charles Martin, our executors, administrators,
and assigns, or such others as we, the said William Barrett and Charles
Martin, our 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 TUYERES FOR
BLAST FURNACES AND OTHER PURPOSES," upon the condition (amongst others)
that we, the said William Barrett and Charles Martin, our executors or

page_text: administrators, by an instrument in writing under our, 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 we, the said William Barrett and Charles Martin,
do hereby declare the nature of our said Invention, and in what manner the
same is to be performed, to be particularly described and ascertained in and
by the following statement, that is to say:-
Our said Invention has for its object the construction of tuyeres which
possess great durability whilst at the same time they are free from some
important disadvantages which have attached to tuyeres as hitherto
constructed.
Furnace tuyeres as previously constructed have depended for their pre-
servation from the effects of fire upon the supply of water to the nozzles by
the ordinary and well-known means; practically, however, it has been found
that the head of water necessary for this purpose is not attainable, or that
from other causes it does not flow in sufficient quantity through the coil of
pipe of which the tuyere is made, and that consequently the nozzle is burnt
through by the heat of the furnace, and the water discharged upon the molten
contents, the result being that the working of the furnace has been affected
and serious explosions frequently caused.
In order to avoid these objections tuyeres constructed in accordance with
our said Invention are formed of heavy piping, such as is used for Perkins's
well-known hot water apparatus, the same being made into a coil of the
desired size. The pipes are arranged as flow and return pipes, and commence
at and return to any convenient positions, at which they are connected
together and placed in the form of a coil or otherwise in a cistern or reservoir
of cold water. When required for use the pipes are previously charged with
water, such space as may be necessary for its expansion being left therein.
As the water passes down the flow pipes to the nozzles it becomes heated and
rises again through the return pipes, and having been cooled by passing
through the cistern or reservoir of cold water again descends, the tuyere pipes
being thus constantly charged with a circulating current of water.
Tuyeres constructed as before described are especially applicable to blast
furnaces, but they may also be used for other analogous purposes to which
they are applicable.
Having thus declared and ascertained the nature of the said Invention,

page_text: and the manner in which it is to be performed, we would observe in
conclusion that what we consider novel and original, and therefore claim as
constituting the Invention secured to us by the said herein-before in part
recited Letters Patent is, the construction and arrangement of tuyeres for
blast furnaces and other purposes, substantially as herein-before described and
set forth, or any mere modifications thereof.
In witness whereof we, the said William Barrett and Charles Martin,
have hereunto set our hands and seals, this Eighteenth day of April,
in the year of our Lord One thousand eight hundred and sixty-eight.
WILLIAM BARRETT. (L.S.)
CHARLES MARTIN.
(L.B.)