Improvements in Preparing Screw-propeller Blades to Resist Corrosion.
Year: 1885

page_text: Improvements in Preparing Screw-propeller Blades to Resist
Corrosion.
We, WILLIAM TELFER, of 29 Greenhill Place, Finnieston Place, Glasgow, in the
County of Lanark, North Britain, Boatbuilder, and ROBERT KING, of Howrah
Cottage, Calside, Paisley, in the County of Renfrew, North Britain, Dyer do hereby
declare the nature of our said invention for "IMPROVEMENTS IN PREPARING SCREW-
PROPELLER BLADES TO RESIST CORROSION " to be as follows, that is to say :-
Our said Invention has for its object to diminish the liability to corrosion of
screw-propeller blades, and it consists in applying to the entire surface of the
blades or to the parts found to be most subject to corrosion, an adherent coating of
a vitreous composition or enamel. Such coating may consist principally of silica
or sand but may have combined with it if wished other ingredients ordinarily
employed in forming enamels. In order to apply the enamel the propeller or
propeller blade having had the surface which is to be protected well cleaned is
heated in a furnace to a temperature sufficient to melt the enamelling material
and cause it to adhere to the metal, the material being applied thereto in the
manner ordinarily practised in enamelling baths and other iron articles.
If the enamel is applied over the entire surface of the propeller or propeller
blade it will not only protect the metal from corrosion but will also diminish
the frictional action of the water on the blades.
Dated this twenty-sixth day of February 1885°
EDMUND HUNT,
Applicants' Agent.

page_text: We, WILLIAM TELFER, of 29 Greenhill Place, Finnieston Place, Glasgow, in the
County of Lanark, North Britain, Boatbuilder, and ROBERT KING, of Howrah
Cottage, Calside, Paisley, in the County of Renfrew, North Britain, Dyer, 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, that is to say :-
Our said Invention has for its object to diminish the liability to corrosion of
screw-propeller blades, and it consists in applying to the entire surface of the
blades or to the parts found to be most subject to corrosion, an adherent coating
of a vitreous composition or enamel. Such coating may consist principally of
silica or sand but may have combined with it if wished other ingredients ordinarily
employed in forming enamels such as ground glass and chloride of sodium. In
order to apply the enamel the propeller or propeller blade having had the surface
which is to be protected well cleaned with a sand stone or in any other suitable
manner is heated in a furnace to a temperature sufficient to melt the enamelling
material and cause it to adhere to the metal, the material being applied thereto in
the manner ordinarily practised in enamelling baths and other iron articles.
If the enamel is applied over the entire surface of the propeller or propeller
blade it will not only protect the metal from corrosion but will also diminish the
frictional action of the water on the blades.
Having now particularly described and ascertained the nature of our said
Invention and in what manner the same is to be performed we declare that
what we claim is
The process of preparing screw propeller blades to resist corrosion by applying
a vitreous coating or enamel to the entire surface or to parts of such blades,
substantially as hereinbefore described.