IMPROVEMENTS IN SCREW PROPELLERS FOR STEAM VESSELS, WHEREBY THE OXIDATION OR CORROSION OF THE SAME IS PREVENTED OR REDUCED TO A MINIMUM
Year: 1879

page_text: LETTERS PATENT to Cyril Newmarch Dunderdale, of Glasgow, in the County
of Lanark, North Britain, for the Invention of "IMPROVEMENTS IN SCREW
PROPELLERS FOR STEAM VESSELS, WHEREBY THE OXIDATION OR CORROSION OF
THE SAME IS PREVENTED OR REDUCED TO A MINIMUM."
Sealed the 23rd September 1879, and dated the 21st June 1879.
PROVISIONAL SPECIFICATION left by the said Cyril Newmarch Dunderdale
at the Office of the Commissioners of Patents on the 21st June 1879.
CYRIL NEWMARCH DUNDERDALE, of Glasgow, in the County of Lanark, North
Britain. "IMPROVEMENTS IN SCREW PROPELLERS FOR STEAM VESSELS, WHEREBY
THE OXIDATION OR CORROSION OF THE SAME IS PREVENTED OR REDUCED TO A
MINIMUM."
This Invention relates to improvements in screw propellers for steam vessels, and
has for its object to protect the said propellers from oxidation or corrosion.
According to the said Invention the propellers, whether they be composed of
iron, steel, brass, or bronze, are coated with nickel, or tin, or such like metal, which
is not liable to oxidation or corrosion. The said coating is effected by depositing
the nickel, tin, or the like upon the surface or surfaces of the propellers by currents
of dynamic electricity generated by magneto-electric and electro-magnetic machines,
or by electro-chemical currents generated by and derived from voltaic piles or
batteries.

page_text: SPECIFICATION in pursuance of the conditions of the Letters Patent filed by
the said Cyril Newmarch Dunderdalo in the Great Seal Patent Office on the
20th December 1879.
CYRIL NEWMARCH DUNDERDALE, of Glasgow, in the County of Lanark, North
Britain. "IMPROVEMENTS IN SCREW PROPELLERS FOR STEAM VESSELS, WHEREBY
THE OXIDATION OR CORROSION OF THE SAME IS PREVENTED OR REDUCED TO A
MINIMUM."
My Invention relates to improvements in screw propellers for steam vessels, and
has for its object to protect the said propellers from oxidation or corrosion.
According to the said Invention the propellers, whether they be composed of
iron, steel, brass, or bronze, are coated with nickel, or tin, or such like metal, which
is less liable to oxidation or corrosion. The said coating is effected by depositing
the nickel, tin, or the like upon the surface or the surfaces of the propellers by
currents of dynamic electricity generated by magneto-electric or electro-magnetic
machines, or by electro-chemical currents generated by and derived from voltaic
piles or batteries.
Having now described and particularly ascertained the nature of my said Inven-
tion, and the system, mode, or manner in or under which the same is or may be
used or practically 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 hereinbefore in part recited Letters Patent is,-
The screw propellers hereinbefore described, that is to say, screw propellers whose
body, or the metal of which they are constructed, is kept out of contact with the
water and air by the electro-deposition thereon of a non-oxidisable metal, or a
metal which has a less tendency to oxidation than that of which the propeller is
constructed.
In witness whereof, I, the said Cyril Newmarch Dunderdale, have hereunto set
my hand and seal, this Seventeenth day of December, in the year of our
Lord One thousand eight hundred and seventy nine.
CYRIL NEWMARCH DUNDERDALE. (L.S.)