IMPROVEMENTS IN COMPOSITIONS FOR COATING THE BOTTOMS OF NAVIGABLE VESSELS AND THE SUBMERGED PORTIONS OF FLOATING AND FIXED STRUCTURES
Year: 1878

page_text: LETTERS PATENT to Henry Allington Harvey, of Plymouth, in the County
of Devon, for the Invention of "IMPROVEMENTS IN COMPOSITIONS FOR COATING
THE BOTTOMS OF NAVIGABLE VESSELS AND THE SUBMERGED PORTIONS OF
FLOATING AND FIXED STRUCTURES,”
PROVISIONAL SPECIFICATION -left by the said Henry Allington Harvey
at the Office of the Commissioners of Patents on the 17th July 1878.
HENRY ALLINGTON HARVEY, of Plymouth, in the County of Devon.
" IMPROVE-
MENTS IN COMPOSITIONS FOR COATING THE BOTTOMS OF NAVIGABLE VESSELS AND
THE SUBMERGED PORTIONS OF FLOATING AND FIXED STRUCTURES."
The object of my Invention is to provide compositions suitable for preventing the
fouling of the exterior surfaces of floating and other submerged structures, and for
more efficiently protecting the materials of which such structures are built up or
composed. For these purposes I employ as the anti-fouling agent arsenical mundic,
applied with other substances as hereafter mentioned.
In carrying my Invention into practice under the first part of my Invention I
proceed in manner following:-I reduce arsenical mundic or arsenical iron pyrites to
a fine state of division by grinding, and mix, in such proportion as may be deemed
necessary, and to be determined by the percentage of arsenic contained in the ore,
with oxide of iron or oxide of zinc and ochre or other colouring matter, and grind
to the consistency of a paint with linseed oil or other vehicle, and litharge or other
drier. The composition may then be applied as ordinary paint, or may be boiled
until it assumes the consistency of pitch, when it must be applied hot, thereby
forming a thick coating.

page_text: Over the coating prepared as above I add another, consisting of arsenical mundic
in a fine state of division, and a small portion of oxide of zinc mixed with linseed
oil and driers, and either boiled or heated until it assumes the consistency of pitch,
or applied as an ordinary paint.
Under the second part of my Invention I take arsenical mundic, and after mixing
it with boiled linseed oil and driers if necessary, either with or without boiling, as
mentioned above, and apply it to the surface over any foundation coating of ordinary
or other suitable paint or composition.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Henry Allington Harvey in the Great Seal Patent Office on the
17th January 1879.
HENRY ALLINGTON HARVEY, of Plymouth, in the County of Devon. " IMPROVE-
MENTS IN COMPOSITIONS FOR COATING THE BOTTOMS OF NAVIGABLE VESSELS,
AND THE SUBMERGED PORTIONS OF FLOATING AND FIXED STRUCTURES."
The object of my Invention is to provide compositions suitable for preventing the
fouling of the exterior surfaces of floating and other submerged structures, and for
more efficiently protecting the materials of which such structures are built up or
composed. For these purposes I employ as the anti-fouling agent arsenical mundic,
applied with other substances as hereafter mentioned.
In carrying my Invention into practice under the first part thereof I proceed in
manner following:-I reduce arsenical mundic or arsenical iron pyrites to a fine
state of division by grinding, and mix in such proportions as may be necessary, and
to be determined by the percentage of arsenic contained in the ore, with oxide of
iron or oxide of zinc and ochre or other colouring matter, and grind the whole to
the consistency of a paint with linseed oil or other vehicle, and litharge or other
drier. The composition may then be applied as ordinary paint, or may be boiled
until it assumes the consistency of pitch, when it must be applied hot, thereby
forming a thick coating.
For ships and other navigable floating bodies I have found the composition pre-
pared as above to answer well as an anti-fouling coating, more especially when the
arsenical mundic employed constituted one-half of the solid matter employed in
the composition, and contained from twelve to fifteen per centum of arsenic.
In some cases, say where vegetation is rank and animal life abundant, as in the
tropics, and where the very best results as regards non-fouling are desired, I add
another coating over the one above described. This second coating consists of
arsenical mundic in a fine state of division and a small quantity of oxide of zinc
mixed with linseed oil and driers, and either boiled or heated until it assumes the
consistency of pitch or applied as an ordinary paint.
Under the second part of my Invention I take arsenical mundic, and after
mixing it with boiled linseed oil and driers if necessary, either with or without boil-
ing, as mentioned under the above first part, and apply it to the desired surface over
any foundation coating of ordinary or other suitable paint or composition.
Having now described the nature of my said Invention and particularized the
same in such manner that others will be enabled to carry my improvements into
practice, I would have it understood that the proportion in which the arsenical
mundic is employed relatively to the other materials may be varied, and that
pigments of different kinds may be used, but what I claim is,
First. (a) Anti-fouling compositions with arsenical mundic combined therein,
substantially as described. (b) The double coating of surfaces with compositions
containing arsenical mundic, substantially as described.
Second. Applying compositions containing arsenical mundic over surfaces
previously coated with any suitable foundation coating, substantially as described.
In witness whereof, I, the said Henry Allington Harvey, have hereunto set
my hand and seal, the Fifteenth day of January, in the year of our
Lord One thousand eight hundred and seventy-nine
HENRY ALLINGTON HARVEY. (L.S.)
Signed, sealed, and delivered by the before-
named Henry Allington Harvey, in the
presence of EDMUND PRIDHAM,
Sol, Plymouth.