AN IMPROVEMENT IN PAINTS OR COMPOSITIONS USED FOR COATING IRON OR WOODEN VESSELS AND OTHER STRUCTURES EXPOSED TO THE ACTION OF SEA WATER
Year: 1865

page_text: LETTERS PATENT to John Cornelius Craigie Halkett, of Cramond House,
in the County of Mid Lothian, North Britain, for the Invention of
"AN IMPROVEMENT IN PAINTS OR COMPOSITIONS USED FOR COATING IRON OR
WOODEN VESSELS AND OTHER STRUCTURES EXPOSED TO THE ACTION OF SEA
WATER."
Sealed the 26th September 1865, and dated the 28th March 1865.
PROVISIONAL SPECIFICATION left by the said John Cornelius Craigie
Halkett at the Office of the Commissioners of Patents, with his Petition,
on the 28th March 1865.
I, JOHN CORNELIUS CRAIGIE HALKETT, of Cramond House, in the County
of Mid Lothian, North Britain, do hereby declare the nature of the said
Invention for "AN IMPROVEMENT IN PAINTS OR COMPOSITIONS USED FOR COATING
IRON OR WOODEN VESSELS AND OTHER STRUCTURES EXPOSED TO THE ACTION OF SEA
WATER," to be as follows:-
This Invention is applicable to paints or compositions used for coating iron
or wooden vessels, buoys, piles, piers, or other structures liable to damage or
deterioration by exposure to the action of sea water.
The improvement consists principally in the employment of sulphate of
baryta or of any other salt of baryta which is insoluble (or almost insoluble) in
sea water, either in combination with poisonous, saponaceous, oleaginous, or

page_text: resinous compounds, or with coal tar, asphaltum, or gummy substances,
as a principal ingredient in such paints or compositions, the chief object of
such employment being to render such paints or compositions more insoluble
and less liable than hitherto to damage or deterioration by exposure to the
action of sea water. For example, I take about 3 lbs. of sulphate of baryta,
1 lb. of boiled linseed oil, and as an aid to drying (say) about 4 oz. of copal
varnish.
This mixture I use as a "vehicle" for any of the known anti-fouling and
anti-corrosive compounds, employing (by preference) the poisonous compounds
mentioned in the Specification of the Patent granted to Francis Cruickshank,
dated 4th August 1861 No 1041
SPECIFICATION in pursuance of the conditions of the Letters Patent, filed
by the said John Cornelius Craigie Halkett in the Great Seal Patent
Office on the 27th September 1865.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, Jonn
CORNELIUS CRAIGIE HALKETT, of Cramond House, in the County of Mid
Lothian, North Britain, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her Letters
Patent, bearing date the Twenty-eighth day of March, in the year of our Lord
One thousand-eight hundred and sixty-five, in the twenty-eighth year of Her
reign, did, for Herself, Her heirs and successors, give and grant unto me,
the said John Cornelius Craigie Halkett, Her special licence that I, the said
John Cornelius Craigie Halkett, my executors, administrators, and assigns, or
such others as I, the said John Cornelius Craigie Halkett, 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 vend, within
the United Kingdom of Great Britain and Ireland, the Channel Islands,
and Isle of Man, an Invention for "AN IMPROVEMENT IN PAINTS OR COMPOSITIONS
USED FOR COATING IRON OR WOODEN VESSELS AND OTHER STRUCTURES EXPOSED TO
THE ACTION OF SEA WATER," upon the condition (amongst others) that I, the
said John Cornelius Craigie Halkett, 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.

page_text: NOW KNOW YE, that I, the said John Cornelius Craigie Halkett, do hereby
declare the nature of my 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 :-
My said Invention is applicable to paints or compositions used for coating
iron or wooden vessels, buoys, piles, piers, or other structures liable to damage
or deterioration by exposure to the action of sea water.
The improvement consists principally in the employment of sulphate of
baryta, or of any other salt of baryta which is insoluble or almost insoluble
in sea water, either in combination with poisonous, saponaceous, oleaginous,
or resinous compounds, or with coal tar, asphaltum, bituminous, or gummy
substances, as a principal ingredient in such paints or compositions, the chief
object of such employment being to render such paints or compositions more
insoluble and less liable than hitherto to damage or deterioration by exposure
to the action of sea water. For example, I take about three pounds of sulphate
of baryta, one pound of boiled linseed oil, and as an aid to drying (say)
about four ounces of copal varnish. This mixture I use as a "vehicle" for
any of the known anti-fouling and anti-corrosive compounds, employing (by
preference) the poisonous compounds mentioned in the Specification of the
Patent granted to Francis Cruickshank, dated 4th August 1864 (No. 1941),
or that mentioned in the Specification of the Patent granted to the said
Francis Cruickshank, dated 6th March 1865 (No. 624).
Having thus particularly described my said Invention, and the manner in
which the same is to be performed, I have to state that what I believe to be
novel and original, and claim as secured to me by the herein-before in part
recited Letters Patent is, the employing of a salt of baryta in compositions
used as "vehicles" for anti-fouling and anti-corrosive compounds.
In witness whereof, I, the said John Cornelius Craigie Halkett, have
hereunto set my hand and seal, this Twenty-third day of September
in the year of our Lord One thousand eight hundred and sixty-five.
Witness,
EDMUND HUNT,
Patent Agent,
Glasgow.
J. C. CRAIGIE HALKETT. (L.S.)