AN IMPROVEMENT OR IMPROVEMENTS IN THE MAKING OR MANU- FACTURING OF IRON FROM CERTAIN SLAGS OR CINDERS PRODUCED IN THE WORKING OR MAKING OF THAT METAL
Year: 1822

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, DAVID
MUSHET, of Coleford, in the County of Gloucester, Iron Master, send
greeting.
WHEREAS His present Majesty King George the Fourth, by His Letters
Patent under the Great Seal of Great Britain, bearing date at Westminster,
the Twentieth day of August now last past, did give and grant unto me, the
said David Mushet, His especial licence, full power, sole privilege and
authority, that I, the said David Mushet, my executors, administrators, and
assigns, and such others as I, the said David Mushet, my executors,
administrators, or assigns, should at any time agree with, and no others,
from time to time and at all times thereafter during the term of years
therein expressed, should and lawfully might make, use, exercise, and
vend, within England, Wales, and the Town of Berwick-upon-Tweed, my
Invention of "AN IMPROVEMENT OR IMPROVEMENTS IN THE MAKING OR MANU-
FACTURING OF IRON FROM CERTAIN SLAGS OR CINDERS PRODUCED IN THE WORKING
OR MAKING OF THAT METAL;" in which said Letters Patent there is contained a
proviso obliging me, the said David Mushet, by an instrument in writing

page_text: under my hand and seal, particularly to describe and ascertain the nature
of my said Invention, and in what manner the same is to be performed,
and to cause the same to be inrolled in His Majesty's High Court of
Chancery within six calendar months next and immediately after the date of
the said recited Letters Patent, as in and by the said recited Letters Patent,
reference being thereunto had, will more fully appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
David Mushet, do hereby declare that the nature of my said Invention, and
the manner in which the same is to be performed, is particularly described and
ascertained by the following description thereof; that is to say:-
I take the cinder produced in the refinery furnace, or running-out fire, or
any of the other slags or cinders produced in the process of making or manu-
facturing bar or malleable iron, and reduce thein to a small size by shotting,
or any mechanical contrivance in common use. These slags or cinders
thus reduced I mix with certain proportions of flour lime, according to the
sort of slag or cinder, which experience alone can determine, though one fifth
or one sixth the weight of the slag or cinder in flour lime will be found
sufficient for those containing the greatest quantity of siliceous or other
ingredient. The mixture is moistened so as to bring the lime into close and
continued contact with the ground slags or cinders, and a portion of it charged
upon the blast furnace, along with cominon ores or ironstones, and the iron
contained in the whole smelted into pig iron. When iron so produced is
melted in the refinery or running-out fire it is found more fusible, and works
more gray than the usual qualities of pig iron. It consequently requires
longer time to refine, and ought not to be run out till the extra fusibility has
been reduced to a common standard, when the metal will be found honeycombed
throughout. When this is properly attended to and performed, the bar or
malleable iron made from such metal will be found of a tough and fibrous
quality, with some slags or cinders sparingly impregnated with siliceous matter.
Mechanical reduction is all that is necessary, so that the extra fusibility or
grayness is communicated to and obtained in the pig iron, the reduction of
which to a common standard in the refinery or running-out fire affords tough-
ness and fibre to the bar or other sorts of malleable iron.
In witness whereof, I, the said David Mushet, have hereunto set
my hand and seal, the Seventeenth day of February, in the year
of our
Lord One thousand eight hundred and twenty-three.
DAVID MUSHET. (L.S.)

page_text: AND BE IT REMEMBERED, that on the same Seventeenth day of
February, in the year above mentioned, the aforesaid David Mushet came
before our Lord the King in His Chancery, and acknowledged the Specification
aforesaid, and all and every thing therein contained, in form above written.
And also the Specification aforesaid was stamped according to the tenor of
the Statute in that case made and provided.
Inrolled the Nineteenth day of February, in the year above written.