AN IMPROVED ANTI-FOULING AND PRESERVATIVE COMPOSITION FOR SHIPS' BOTTOMS AND OTHER SUBMERGED STRUCTURES
Year: 1873

page_text: LETTERS PATENT to Heinrich Rahtjen, of Bremerhaven, Germany,
and temporarily of Basinghall Street, in the City of London, for the
Invention of "AN IMPROVED ANTI-FOULING AND PRESERVATIVE COMPOSITION
FOR SHIPS' BOTTOMS AND OTHER SUBMERGED STRUCTURES."
Sealed the 20th January 1874, and dated the 29th November 1873.
PROVISIONAL SPECIFICATION left by the said Heinrich Rahtjen at the
Office of the Commissioners of Patents, with his Petition, on the
29th November 1873.
!
I, HEINRICH RAHTJEN, of Bremerhaven, Germany, and temporarily :
of Basinghall Street, in the City of London, do hereby declare the
nature of the said Invention for "AN IMPROVED ANTI-FOULING AND PRE-
SERVATIVE COMPOSITION FOR SHIPS' BOTTOMS AND OTHER SUBMERGED STRUCTURES,”
to be as follows:-
3.-
This Invention relates to an improved composition for preserving and
preventing the fouling of iron ships' bottoms as well as other submerged.
iron structures.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent,
filed by the said Heinrich Rahtjen in the Great Seal Patent Office
on the 18th May 1874.
TO ALL TO WHOM THESE PRESENTS SHALL COME, I, HEINRICH
RAHTJEN, of Bremerhaven, Germany, and temporarily of Basinghall
Street, in the City of London, send greeting.
WHEREAS Her most Excellent Majesty Queen Victoria, by Her
Letters Patent, bearing date the Twenty-ninth day of November, in the
year of our Lord One thousand eight hundred and seventy-three, in the
thirty-seventh year of Her reign, did, for Herself, Her heirs and suc-
cessors, give and grant unto me, the said Heinrich Rahtjen, Her special
licence that I, the said Heinrich Rahtjen, my executors, administrators,
and assigns, or such others as I, the said Heinrich. Rahtjen, 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,

page_text: exercise, and vend, within the United Kingdom of Great Britain and
Ireland, the Channel Islands, and Isle of Man, an Invention for
"AN IMPROVED ANTI-FOULING AND PRESERVATIVE COMPOSITION FOR SHIPS'
BOTTOMS AND OTHER SUBMERGED STRUCTURES," upon the condition (amongst
others) that I, the said Heinrich Rahtjen, 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.
- NOW KNOW YE, that I, the said Heinrich Rahtjen, do hereby declare
the nature of the said Invention, and in what manner the same is to
be performed, to be particularly described and ascertained in and by the
following statement, that is to say :-
This Invention relates to an improved anti-fouling and preservative.¨
composition to be applied to the bottoms of iron ships and other sub-
merged iron structures.
The composition consists of the ingredients hereafter named. The
proportions annexed thereto are calculated by weight and are those
which I find to answer best in practice, although I do not confine myself
to the precise proportions given, as it will be understood that the same
may be varied without departing from my Invention.
No. 1. Alcohol, wood naptha, or methylated spirit - 120 parts.
No. 2. Shellac
No. 3. Thick turpentine
No. 4. Linseed oil (boiled)
No. 5. Common rosin
No. 6. Galipot
وو
42
"
8
20
"
and
15
"
-
10
"
No. 7. Tar spirit' (otherwise called tar oil)
-
6
"
No. 8. Tallow
6
->
"
No. 9. Venetian red
-
- 120
"
No. 10. Arsenic
20
"
No. 11. Oxide of zinc
No. 12. Oxide of mercury
3
"
30
"
100

page_text: W
These ingredients are incorporated together in the following manner :
I first dissolve the ingredients indicated above by Nos. 2 and 3 in ingre-
dient No. 1, I then melt together over a moderate fire ingredients Nos.
5, 6, and 8, and afterwards allow the same to cool somewhat until only
E
warm enough to maintain its fluidity, and then mix therewith ingre-
dients Nos. 4 and 7.. I then take the first solution of ingredients Nos.
1, 2, and 3, and add it to the above mixture of ingredients Nos. 4,
5, 6, 7, 8, and stir the whole well together until thoroughly mixed, and
I then add thereto the ingredients Nos. 9, 10, 11, 12, either separately
or together, and mix well together until thoroughly commingled and no
sediment is found. The composition will then be fit for use.
Having described the nature of the Invention and the manner of per-
forming the same, I declare that what I claim as the Invention to be
protected by the herein-before in part recited Letters Patent is, the anti-
fouling and preservative composition consisting of the ingredients and 1
prepared in the manner substantially as herein specified.
In witness whereof, I, the said Heinrich Rahtjen, have hereunto set
my hand and seal, this Sixteenth day of May, in the year of our
Lord One thousand eight hundred and seventy-four.