Improvements in Means for Diminishing the Liability to Corrosion of Screw Propeller Blades.
Year: 1888

page_text: Date of Application, 7th Feb., 1888
Complete Specification Left, 2nd Nov., 1888
Complete Specification Accepted, 7th Dec., 1888
Improvements in Means for Diminishing the Liability to Corrosion
of Screw Propeller Blades.
I, DAVID JOHNSTON, of Eden Villa, Carmichael Street, Govan, in the County of
Lanark, North Britain, Superintendent Engineer to the Allan Line of Steamers,
do hereby declare the nature of this Invention to be as follows, that is to say :-
My said Invention has for its object to diminish the liability to corrosion of screw-
propeller blades; and it consists principally in coating the parts of the blades on
which experience has shown that corrosion ordinarily acts, with vulcanite or other
suitable sulphurised compound of rubber. My Invention also comprises the entire
covering of the blade with vulcanite or sulphurised rubber if found desirable.
In carrying out my Invention I apply the sulphurised rubber to the blades, in the
plastic or semi-plastic condition in which such rubber is before the vulcanisation of it
is completed by the application of heat. The rubber may be made to adhere to the
blade at the outset by means of rubber solution or other suitable cement, the
subsequent heating operation making it adhere permanently. The rubber has to be
kept pressed against the blade during the heating operation; and for this purpose,
after the rubber has been applied to the blade it is wrapped or bound with cotton or
other suitable cloth, or any other convenient means is used to keep the rubber in
contact with the blade.
Th
1000
EDMUND HUNT,
Applicant's Agent.

page_text: Improvements in Means for Diminishing the Liability to Corrosion
of Screw Propeller Blades.
I, DAVID JOHNSTON, of Eden Villa, Carmichael Street, Govan, in the County of
Lanark, North Britain, Superintendent Engineer to the Allan Line of Steamers, do
hereby declare the nature of this invention and in what manner the same is to be
performed, to bo particularly described and ascertained in and by the following
statement, that is to say :-
My said Invention has for its object to diminish the liability to corrosion of screw
propeller blades; and it consists principally in coating the parts of the blades on
which experience has shown that corrosion ordinarily acts, with vulcanite or other
suitable sulphurised compound of rubber. My Invention also comprises the entire
covering of the blade with vulcanite or sulphurised rubber if found desirable.
In carrying out iny. Invention I apply the sulphurised rubber to the blades, in the
plastic or semi-plastic condition in which such rubber is before the vulcanisation of it
is completed by the application of heat. The rubber may be made to adhere to the
blade at the outset by means of rubber solution or other suitable cement, the
subsequent heating operation making it adhere permanently. The rubber has to be
kept pressed against the blade during the heating operation; and for this purpose,
after the rubber has been applied to the blade it is wrapped or bound with cotton or
other suitable cloth, or any othor convenient means is used to keep the rubber in
contact with the blade.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed, I declare that what I
claim is :-
The coating of the blades of screw propellers partially or entirely with sulphurised
rubber the coating being applied substantially in the manner and for the purposes
herein before described.
Tabl
1
EDMUND HUNT,
Applicant's Agent.