IMPROVEMENTS IN COMPOSITIONS FOR PROTECTING OR PRESERVING SHIPS' BOTTOMS AND OTHER SUBMERGED SURFACES
Year: 1876

page_text: LETTERS PATENT to John Henry Johnson, of 47, Lincoln's Inn Fields, in the
County of Middlesex, Gentleman, for the Invention of "IMPROVEMENTS IN
COMPOSITIONS FOR PROTECTING OR PRESERVING SHIPS' BOTTOMS AND OTHER
SUBMERGED SURFACES." A communication from abroad by Thorwald M. W.
Hoeg, of Steinwarder, Hamburg, in the Empire of Germany.
PROVISIONAL SPECIFICATION left by the said John Henry Johnson at the
Office of the Commissioners of Patents on the 12th October 1876.
<<
JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middlesex,
Gentleman. IMPROVEMENTS IN COMPOSITIONS FOR PROTECTING OR PRESERVING
SHIPS BOTTOMS AND OTHER SUBMERGED SURFACES." A communication from
abroad by Thorwald M. W. Hoeg, of Steinwarder, Hamburg, in the Empire of
Germany.
This Invention relates to an improved composition intended more particularly to
be applied to iron ship bottoms and other submerged iron surfaces for the purpose of
preserving them from corrosion and fouling, and preventing the growth of barnacles
and other marine substances.
The composition consists of the following ingredients employed in about the
under-mentioned proportions:
No. 1. Iron oxide mixed with magnesia carbonicum in the pro-
portion of about 3 to 1
2. Oxide of lead -
3. Oxide of mercury
4. Shellac and resina sandaraca, half and half
-
20 parts
»
"
-
12
"
-
13
"
6. Aethyl alcohol mixed with benzol in the proportion of
-
33
"
"
-
8
5. Lard, oil, and oleum picis
about 2 to 1
7. Auri pigment-
8. Venetian turpentine
9. Nickel oxydul
-
->>
-
->
-
2723 32∞∞
כן
11

page_text: The above ingredients are combined together in the following manner:-No. 4 is
dissolved in No. 6, then No. 8 is added, and thereafter No. 5, after which Nos. 1, 2,
3, 7, and 9 are mixed with the fluid of No. 4, 5, 6, and 8, and worked together in a
mill. The composition is then allowed to stand, say, for a period of three days when
it will be ready for use.
It should be observed that the various metallic oxides are mixed in such a manner
that if they are combined with the said solution they produce a certain activity of
oxidation which prevents the fouling in sea water.
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Henry Johnson in the Great Seal Patent Office on the 12th
April 1877.
JOHN HENRY JOHNSON, of 47, Lincoln's Inn Fields, in the County of Middlesex,
Gentleman. "IMPROVEMENTS IN COMPOSITIONS FOR PROTECTING OR PRESERVING
SHIPS BOTTOMS AND OTHER SUBMERGED SURFACES." A communication from
abroad by Thorwald M. W. Hoeg, of Steinwarder, Hamburg, in the Empire of
Germany.
The said Invention relates to an improved composition intended more particularly
to be applied to iron ship's bottoms and other submerged iron surfaces for the
purpose of preserving them from corrosion and fouling, and preventing the growth
of barnacles and other marine substances.
The composition consists of the following ingredients employed in about the
under-mentioned proportions :-
100 parts
The above ingredients are combined together in the following manner:-No. 4 is
dissolved in No. 6, then No. 8 is added, and thereafter No. 5, after which Nos. 1, 2,
3, 7, and 9 are mixed with the fluid of Nos. 4, 5, 6, and 8, and worked together in
a mill. The composition is then allowed to stand, say, for a period of three days,
when it will be ready for use.
It should be observed that the various metallic oxides are mixed in such a manner
that if they are combined with the said solution they produce a certain activity of
oxidation which prevents the fouling in sea water.
Having now described and particularly ascertained the nature of the said Inven-
ntion, and the manner in which the same is or may be used or carried into effect, I
would observe in conclusion that what I consider to be novel and original and
therefore claim as the Invention secured to me by the herein-before in part recited

page_text: Letters Patent is, the composition for protecting or preserving ships' bottoms and other
submerged surfaces prepared substantially in the manner herein-before described.
In witness whereof, I, the said John Henry Johnson, have to this my Speci-
fication set my hand and seal, this Eleventh day of April, One thousand
eight hundred and seventy-seven.
J. HENRY JOHNSON. (L.S.)