Year: 1888

page_text: Date of Application, 24th Mar., 1888
Complete Specification Left, 24th Dec., 1888
Complete Specification Accepted, 29th Jan., 1889
I, GEORGE CADENHEAD, 79 Port-Glasgow Road, Greenock, in the County of
Renfrew, Iron Shipbuilder, do hereby declare the nature of this Invention to be as
follows:-
This Invention which relates to improvements in screw propellers consists in so
arranging the blades of such propellers that one or more of these blades looking from
the stern of the ship is or are situated on the propeller shaft in a vertical or
horizontal plane behind. or in front of the other blade or blades whereby a better
propelling effect is obtained. In constructing a two-bladed propeller the blades
are formed upon or attached to a long boss in such a way that one of the blades
is in front of the other or each blade may be formed upon or attached to a
separate boss, these bosses being brought close up to or butted against each other
upon the propeller shaft. Similarly in forming a three-bladed propeller the blades
are attached to or formed on a boss or bosses in such a position that two of the
blades looking from the stern of the ship forward are behind or in front, of the
third blade and one of the two is behind or in front of the other. In forming a
four-bladed propeller the same system of construction is carried out, each blade being
upon a separate boss or two blades may be formed on or secured to the same boss
either in the same or in different vertical planes or the four blades may be secured
or formed upon one boss the blades being arranged two and two in different vertical
planes or all four in different vertical planes, and similarly with propellers having a
greater number of blades.
Dated this Twentythird day of March 1000
CRUIKSHANK & FAIRWEATHER,
62, Saint Vincent Street, Glasgow,
Agents.

page_text: 1, GEORGE CADENHEAD, 79 Port Glasgow Road, Greenock. in the County of
Renfrew, Iron Shipbuilder, do hereby declare the nature of this invention and in what
manner the saine is to be performed, to be particularly described and ascertained in
and by the following statement:-
This Invention which relates to improvements in screw propellers consists in so
arranging the blades of such propellers that one or more of these blades looking
from the stern of the ship is or are situated on the propeller shaft in a vertical
or horizontal plane behind or in front of the other blade or blades whereby a better
propelling effect is obtained. In constructing a two-bladed propeller the blades are
formed upon or attached to a long boss in such a way that one of the blades is
in front of the other or each blade may be forined upon or attached to a separate
boss, these bosses being brought close up to or butted against each other upon the
propeller shaft. In forming a three-bladed propeller the blades are as illustrated
by figures 1 and 2 of the appended drawings attached to or formed on separate
bosses A, A1, A2, in such a position that two of the blades (B and C) looking from
the stern of the ship forward are behind the third blade D and the blade C is behind
the other blade B. The bosses A, A', A³, may be brought close up to or butted against
each other or as seen at figure 2 rings or washers E, may be placed on the propeller
shaft F between the bosses in order to increase the distance longitudinally of the shaft
between the blades B, C, D, or all three blades may be formed or secured one behind
the other on one long boss. In forming a four-bladed propeller the same system of
construction is carried out, each blade being upon a separate boss or two blades may
be formed on or secured to the same boss either in the same or in different vertical
planes or as shown by figures 3 and 4 of the drawings the four blades G, H, I, J,
may be secured or formed upon one boss K the blades being arranged two and two in
different vertical planes or all four in different vertical planes, and similarly with
propellers having a greater number of blades.
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 :-
In a propeller having two or more blades so arranging the said blades that one or
more of them is or are situated on the shaft in a plane in front of or behind the other
blade or blades substantially as hereinbefore described and in part illustrated on the
accompanying drawings.
Dated this Twentysecond day of December 1888.