A CERTAIN PROCESS FOR THE APPLICATION OF THE PRISMATIC COLOURS TO THE SURFACE OF STEEL AND OTHER METALS, AND USING THE SAME IN THE MANUFACTURE OF VARIOUS ORNAMENTS
Year: 1822

page_text: TO ALL TO WHOM THESE PRESENTS SHALL COME, I, JOHN
BARTON, Deputy Comptroller of His Majesty's Mint, send greeting.
WHEREAS His present Majesty King George the Fourth, in and by His
Letters Patent under the Great Seal of Great Britain, bearing date at
Westminster, the Fourth day of June last, for Himself, His heirs and suc-
cessors, did give and grant unto me, the said John Barton, His special licence,
full power, sole privilege and authority, that I, the said John Barton, my
executors, administrators, and assigns, and every of them, by myself and
themselves; or by my, his, or their deputy or deputies, servants or agents, .or
such others as I, the said John Barton, my executors, administrators, or assigns,
should at any time agree with, and no others, from time to time and at all
times hereafter during the term of years therein expressed, should and lawfully
might make, use, exercise, and vend, within that part of the United Kingdom
of Great Britain and Ireland called England, the Dominion of Wales, and the
Town of Berwick-upon-Tweed, my Invention of "A CERTAIN PROCESS FOR THE
APPLICATION OF THE PRISMATIC COLOURS TO THE SURFACE OF STEEL AND OTHER
METALS, AND USING THE SAME IN THE MANUFACTURE OF VARIOUS ORNAMENTS.;
in which said Letters Patent there is contained a proviso obliging me, the

page_text: said John Barton, 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 said recited Letters Patent, as in and by the
same, reference being thereunto had, will more fully appear.
NOW KNOW YE, that in compliance with the said proviso, I, the said
John Barton, do hereby describe and ascertain the nature of my Invention
and in what manner the same is to be performed, as follows (that is to
say):-
The nature of my Invention consists in the property of decomposing light
that belongs to lines drawn upon the surface of metal, but more particularly to
extremely fine parallel lines, for example, of from five hundred to ten thousand
in the inch, drawn upon the surface of hardened polished steel with a diamond
or any other point sufficiently hard, and thereby producing on the surface of
such steel or other metals primitive or prismatic colours; and which lines may
also be transferred by pressure from such hardened polished steel to other
substances, and so produce similar prismatic colours on the substance to which
the lines are transferred. And I wish it to be distinctly understood that my
Invention consists in the application of these lines or colours by way of
ornament, under such arrangement as the skill and fancy of the workmen may
suggest, and not in the engine or implement by which the operation is per-
formed.
In witness whereof, I, the said John Barton, have hereunto set my
hand and seal, the Second day of August, in the third year of the
reign of our Sovereign Lord George the Fourth, by the Grace of God
of the United Kingdom of Great Britain and Ireland King, Defender
of the Faith, and in the year of our Lord One thousand eight hundred
and twenty-two.

page_text: AND BE IT REMEMBERED, that on the Second day of August, in
the third year of the reign of His Majesty King George the Fourth, the said
John Barton came before our said Lord the King in His Chancery, and
acknowledged the instrument aforesaid, and all and every thing therein con-
tained and specified, in form above written. And also the instrument afore-
said was stamped according to the tenor of the Statute made in the fifty-fifth
year of the reign of His late Majesty King George the Third.
Inrolled the Second day of August, One thousand eight hundred and
twenty-two.