IM- PROVEMENTS IN SHEATHING OR COVERING SEA-GOING VESSELS
Year: 1878

page_text: LETTERS PATENT to John Wallace Douglas McDonald, of Bembridge, in the
Isle of Wight, Rear Admiral in the Royal Navy, for the Invention of "IM-
PROVEMENTS IN SHEATHING OR COVERING SEA-GOING VESSELS."
Sealed the 14th February 1879, and dated the 29th August 1878.
PROVISIONAL SPECIFICATION left by the said John Wallace Douglas
McDonald at the Office of the Commissioners of Patents on the 29th August
1878.
:
JOHN WALLACE DOUGLAS MCDONALD, of Bembridge, in the Isle of Wight, Rear
Admiral in the Royal Navy. "IMPROVEMENTS, IN SHEATHING OR COVERING SEA-
*GOING VESSELS."
PROVISIONAL SPECIFICATION left by the said John Wallace Douglas
McDonald at the Office of the Commissioners of Patents on the 29th August
1878.
:
JOHN WALLACE DOUGLAS MCDONALD, of Bembridge, in the Isle of Wight, Rear
Admiral in the Royal Navy. "IMPROVEMENTS, IN SHEATHING OR COVERING SEA-
*GOING VESSELS."
:
My Invention has for object the protecting the surfaces of sea-going vessels
from fouling or marine growth..
For this purpose I sheath or cover the surface to be protected with artificial horn
secured in place by adhesive substance or other suitable fastening.
My Invention has for object the protecting the surfaces of sea-going vessels
from fouling or marine growth.
For this purpose I sheath or cover the surface to be protected with artificial horn
secured in place by adhesive substance or other suitable fastening.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said John Wallace Douglas McDonald in the Great Seal Patent Office on
the 28th February 1879.
JOHN WALLACE DOUGLAS MCDONALD, of Bembridge, in the Isle of Wight, Rear
Admiral in the Royal Navy. "IMPROVEMENTS IN SHEATHING OR COVERING SEA-
GOING VESSELS."
My Invention has for object the protecting the surfaces of sea-going vessels from
fouling or marine growth, and from corrosion.
For this purpose I sheath or cover the surface to be protected with artificial horn
secured in place by adhesive substance or other suitable fastening.
A convenient mode for carrying out my Invention is illustrated in Figs. 1 and 2
of the accompanying Sheet of Drawings, where a is the metal or material of which
the hull of the vessel to be protected is composed. b, b, are the sheets of artificial
horn, such as is known in commerce as lantern horn, which are caused to adhere to
the metal or material a by adhesive substance, such as Jeffery's marine glue, of the
kind usually sold by Alfred Jeffery, of Limehouse, for attaching india-rubber,
leather, et cætera, to wood, iron, and other substances.
Other adhesive substances may be used, such as the gutta percha waterproof
solution used and sold by gutta percha manufacturers.
The adhesive substance is applied hot to the surface of the vessel, and the horn is
immediately applied over the coating of adhesive substance. In some cases, I may
somewhat soften the horn by immersion in hot, water before laying it over the
adhesive coating. It may be convenient in some cases, in vessels of wood, or covered
with wood, to use nails in addition to the adhesive substance for fastening the
horn.
I do not confiné myself to tho overlapping of the horn in the manner shown in
Figs. 1 and 2. The sheets may be otherwise arranged, as for example, as shewn in
Figs. 3 and 4.
When the sheets or pieces of-horn-overlap, their exposed edges should lie towards
the stern and bottom of the vessel.
In the Drawings, the foreward part of the vessel is supposed to be towards the
right-hand side of Figs. 1 and 3.
4
Having described the nature of my said Invention, and explained the manner in
which the same is or may be performed or carried into practical effect, I would have
it understood that what I consider to be novol and original, and therefore claim as
the Invention secured to me under the Letters Patent herein-before in part recited
is, the sheathing or covering the bottoms of sea-going vessels with artificial horn,
substantially as herein-before described.
In witness whereof, I, the said John Wallace Douglas McDonald, have hereunto
set my hand, and scal, this Twenty-sixth day of February, in the year of
our Lord One thousand eight hundred and seventy-nine: