AN IMPROVEMENT OR IMPROVEMENTS OF. PLANE IRONS AND TURNING CHISSELS
Year: 1820

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, THOMAS
DYSON, of Abbey Dale, in the Parish of Sheffield, in, the County of York,
Scythe Manufacturer, send greeting.
ما
WHEREAS His, present Majesty King George the Fourth, by His Letters
Patent under the Great Seal of Great Britain, bearing date at Westminster,
the Eleventh day of November last past, for Himself, His heirs and suc-
cessors, did give and grant unto me, the said Thomas Dyson, His especial
license, full power, sole privilege and authority, that I, the said Thomas
Dyson, my exors, admors, and assigns, and every of them, by myself and
themselves, or by my and their deputy or deputies, servants or agents, or such
others as I, the said Thomas Dyson, my exors, admors, 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, and also within all His Majesty's Colonies and
Plantations abroad, my Invention of "AN IMPROVEMENT OR IMPROVEMENTS OF.
PLANE IRONS AND TURNING CHISSELS;" in which said Letters Patent there is
contained a proviso obliging me, the said Thomas Dyson, by an instrument in
writing 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 two calendar months next and immediately after the date of the said
recited Letters Patent, as in and by the same, reference being thereto had,
will more fully and at large appear.

page_text: NOW KNOW YE, that in compliance with the said proviso, I, the said
Thomas Dyson, do hereby describe and ascertain the nature of my said
Invention, and in what manner the same is to be performed, by the following
explanation thereof, that is to say) :-
My said Invention, as it respects plane irons, consists of a loose cutter, to
be made and used in the following manner:-Take a piece of thin rolled
steel; pare it into the shape of the plane iron called a cut iron, and let the
hole or slit extend to the top end (I mean the blunt end) of the cutter, and
make two plates of iron or steel with a screw, in the form and manner of the
double plane irons now used (a round hole only being necessary for the screw
instead of a slit); between those plates apply the aforesaid cutter, and the
same screw will fasten it. The cutter will be supported and strengthened by
the plates, and in consequence of the slit may be put in and taken out by
merely loosening the screw, and the cutter may be raised till worn out, and a
new one inserted as occasion requires. The same cutter may also be used in
the present double plane irons, and that also when the cut iron is worn out.
The nature of my said Invention as it respects turning chissels, and the manner
in which the same is to be performed, may be learnt from the explanation
already given respecting plane irons, the same consisting of a similar loose
cutter to be applied between two plates of iron or steel, and fastened by a
screw in the same manner as in the plane irons.
In witness whereof, I, the said Thomas Dyson, have hereunto set my hand
and seal, the Fifteenth day of December, in the year of our Lord
One thousand eight hundred and twenty