An Improved Anti-corrosive Composition for Protecting Iron Vessels or the like.
Year: 1889

page_text: Date of Application, 24th Aug., 1889
Complete Specification Left, 27th Aug., 1889-Accepted, 28th Sept., 1889
PROVISIONAL SPECIFICATION.
An Improved Anti-corrosive Composition for Protecting Iron Vessels
or the like.
A communication from abroad by Doctor PIETRO LEONARDI, Professor, and PIETRO
ZEN, Agent of the Navigazione General Italiana, both of Venice, in the Kingdom
of Italy.
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E. of the Agency for Foreign
Patent Solicitors 6 Lord Street Liverpool and 6 Bank Street Manchester both in
the County of Lancaster and 323 High Holborn in the County of Middlesex, Civil
Enginer, do hereby declare the nature of this invention to be as follows :-
The circumstance that iron and steel structures exposed to the action of sea water
are somewhat rapidly coated with very closely adherent shells and vegetation causes;
firstly, in the case of ships, the loss of a considerable amount of speed, and secondly,
the expense of having to be cleaned at short intervals, for instance six months.
Efforts have been made during the last 20 years to get rid of this serious drawback
by finding a varnish or some other composition which should preserve ships' hulls
and the like, at least for some considerable time, from the formation of organic
incrustations.
The subject of the present invention is a varnish, which has given excellent results
for this purpose, and which the inventors have called "Leonardi's submarine
varnish."
The following is its approximate composition
The first coat may consist of a solution of tar in essence of turpentine or benzine
or in any other hydrocarbon of a suitable density according to the season and the
temperature, with the addition of 10 per cent. of peroxide of iron.
If desired the first coat can consist of any other varnish ordinarily used, mixed
with 10 per cent. of peroxide of iron or red lead.
The second coat or even sole coat, if so desired, is composed of 10 per cent. of
ammoniacal chloride of mercury (Hydrargyrum bichloratum ammoniatum); 10 per
cent. of white arsenic (acidum arsenicosum) or of metallic arsenic of 20 to 30 per
cent. of oxide of iron (Ferruin oxydatum), the whole mixed with 100 parts of the
above described solution of tar and turpentine or other varnish as in the first
coat.
The following advantages are presented by this coating.
1. It keeps the surface to which it has been applied clean for a longer time than
those coatings hitherto employed, say for one year.
2. It may be applied direct to iron and steel, preserving them from rusting without
any necessity for a coat of red lead or other composition.
3. It dries rapidly (almost instantaneously) thus effecting a great saving of. time.
4. It does not crack or peel off and can be used at any season in cold; damp or
rainy weather; it can even be applied when the bottom of the ship or other surfac
is still submerged.
5. It can be used as a single coating, thus effecting a great saving of labour when
it is not desired to give two coats.
Dated this 93rd day of August 1889
WM. P. THOMPSON & Co.,
Agents for the Applicant.

page_text: COMPLETE SPECIFICATION.
An Improved Anti-corrosive Composition for Protecting Iron Vessels
or the like.
A communication from abroad by PIETRO LEONARDI, Professor and Doctor, and
PIETRO ZEN, Agent of the Navigazione General Italiana, both of Venice, in the
Kingdom of Italy.
:
I, WILLIAM PHILLIPS THOMPSON F.C.S., M.I.M.E. of the Agency for Foreign
Patent Solicitors 6 Lord Street Liverpool and 6 Bank Street Manchester both in
the County of Lancaster and 323 High Holborn in the County of Middlesex, Civil
Engineer do hereby declare the nature of this invention and in what manner
the same is to be performed, to be particularly described and ascertained in and by
the following statement :-
The circumstance that iron and steel structures exposed to the action of sea water
are somewhat rapidly coated with very closely adherent shells and vegetation
causes, firstly, in the case of ships, the loss of a considerable amount of speed,
and secondly, the expense of having to be cleaned at short intervals, for instance
six months.
Efforts have been made during the last 20 years to get rid of this serious drawback
by finding a varnish or some other composition which should preserve ships' hulls
and the like, at least for some considerable time, from the formation of organic
incrustations.
The subject of the present invention is a varnish, which has given excellent results
for this purpose, and which the inventors have called "Leonardi's submarine
varnish."
The following is its approximate composition:
The first coat may consist of a solution of tar in essence of turpentine or benzine
or in any other hydrocarbon of a suitable density according to the season and the
temperature, with the addition of 10 per cent. of peroxide of iron.
If desired the first coat can consist of any other varnish ordinarily used mixed with
10 per cent. of peroxide of iron or red lead.
The second coat or even sole. coat, if so desired, is composed of 10 per cent. of
ammoniacal chloride of mercury (Hydrargyrum bichloratum ammoniatum); 10 per
cent. of white arsensic (acidum arsenicosum) or of metallic arsenic of 20 to 30 per
cent. of oxide of iron (Ferrum oxydatum), the whole mixed with 100 parts of the
above described solution of tar and turpentine or other varnish as in the first
coat.
The following advantages are presented by this coating.
1. It keeps the surface to which it has been applied clean for a longer time than
those coatings hitherto employed, say for one year.
2. It may be applied direct to iron and steel, preserving them from rusting without
any necessity for a coat of red lead or other composition.
3. It dries rapidly (almost instantaneously) thus effecting a great saving of time.
4. It does not crack or peel off and can be used at any season in cold, damp or
rainy weather; it can even be applied when the bottom of the ship or other surface
is still submerged.
5. It can be used as a single coating, thus effecting a great saving of labour when
it is not desired to give two coats.
Having now particularly described and ascertained the nature of the said inven-
tion and in what manner the same is to be performed as communicated to me
by my foreign correspondents, I declare that what I claim is :-
A submarine varnish composed of the above mentioned elements in the proportions
substantially as above described.
Dad hoc