Improvements in or relating to the Hulls of Steam Vessels to Increase their 'Speed.
Year: 1892

page_text: Date of Application, 24th May, 1892
Complete Specification Left, 24th Feb., 1893-Accepted, 25th Mar., 1893
PROVISIONAL SPECIFICATION.
Improvements in or relating to the Hulls of Steam Vessels to
Increase their 'Speed.
I HENRY CHRISTIE of 5 Askew Crescent Uxbridge Road, Shepherds Bush
London, Gentleman do hereby declare the nature of this invention to be as
follows:-..
For the purpose of my invention I make the hull of a vessel on each side,
starting from just behind the bow with an inverted step like projection which
gradually increases in width and then diminishing again to and terminates at the
"after quarter" the projection representing an inverted inclined plane at an angle
from front to rear so that the action of the stern propeller has a tendency to drive
the forepart towards the surface of the water and thus reduce the force necessary
to propel the vessel or in other words, the nominal horsepower would send the
vessel at a higher speed by reducing immersion and the consequent displacement.
The step like projection referred to may be part of the structure or added to it
and can be wholly below the water line.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said H. Christie.
COMPLETE SPECIFICATION.
Improvements in or relating to the Hulls of Steam Vessels to
Increase their Speed.
I HENRY CHRISTIE of 5 Askew Crescent, Uxbridge Road, Shepherds Bush,
London, Gentleman, 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 :-
For the purpose of my invention I make the hull of a vessel on each side
starting from just behind the bow with an inverted step like projection which
gradually increases in width and then diminishes again to and terminates at the
"after quarter" the projection representing an inverted inclined plane at an angle
from front to rear so that the action of the stern propeller has a tendency to drive
the forepart towards the surface of the water and thus reduce the force necessary
to propel the vessel or in other words the nominal horsepower would send the
vessel at a higher speed by reducing immersion and the consequent displacement.
The step like projection referred to may be part of the structure or added to it
below the water line.
My invention will be clearly understood upon reference to the annexed sheet of
drawings in which Figure 1 is a bottom plan of a vessel constructed according to
my invention.
Figure 2 is a side elevation of the same, while Figure 3 is a front view and
Figure 4 are the lines of the vessel taken upon the section 1. 2.
To carry my invention into practice I form the vessels side with a gradual
deepened undercut A from the bow to any convenient distance backward, preferably
to that part of the vessel corresponding to its widest beam from which the under-
cut becomes gradually shallower as indicated by the cross sectional lines Figure 4
taken on the lines 1. 2, of Figure 2 as before described until they become merged
into the general contour of the ship.

page_text: Said undercut A forms a plane corresponding laterally or transversely to the
surface plane of the water but longitudinally it is inclined thereto as indicated more
particularly in Figure 2 and is wholly below the water line the degree of said
inclination varying according to the special requirements of the vessel in which it
is adopted.
By adopting the above arrangements I am enabled to increase the speed of the
vessel as before described by the action of the inclined plane upon the water when
the vessel is driven forward by its propeller tending to lift the vessel and reduce its
immersion and consequently its resistance to propulsion.
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 :-
-
Constructing a vessel with an undercut on each side to form a plane anglewise to
the surface plane of the water line from the bows to near the after run in the
manner shown for the purpose described.
2000
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said H. Christie.
H. GARDNER,
Patent Agent, 166, Fleet Street, London,
Agent for the said H. Christie.