Year: 1889

page_text: I RICHARD HARNETT of Bayview, Carrigaline, Co. Cork, Ireland, 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:
The objects of this invention are to increase the speed of the Vessel by diminishing
the resistance to its, motion through the water to add buoyancy and stability and
improved weatherly qualities and to obtain the greatest possible strength with the
minimum amount of material, these objects I obtain by shaping the hull of the Vessel
as follows:-
According to this Invention the longitudinal section of the Vessel forms a segment
of a circle the deck line being the chord and the bottom of the Vessel the arc. In the
transverse section of the Vessel the main deck forms with the sides a triangle with
the apex downwards, the sides of the Vessel being rounded with a semicircular sweep
from the load line to the main deck. The plan at the load water line is formed of two
segments of circles.
And in order that my invention may be the better understood I will proceed to
describe the same with reference to the accompanying sheet of drawings in which
Figure 1 represents sheer plan of a Vessel constructed according to my invention.
Figure 2 deck plan. Figure 3. Midship section. Figure 4 body plan, and Figure 5
half breadth plan of same. The same letters refer to the same parts in all the
Figures.
(a) represents hull of the Vessel keel c rudder & bulwarks e main deck f semi-
circular sides. The sides of the Vessel as shewn in Figures 3 and 4 form with the
main deck a triangle with rounded corners at the base, the angle at the apex being
made more or less obtuse according to the amount of buoyancy required the bulwarks
are made flaring as shewn at d, and as shewn at A B C D E Figure 4 (which are
sections on the lines A B C D E of Figure 1) the cross section does not vary in
shape from the midship section either fore or aft of the same the bows and stern of
the Vessel being similar.

page_text: The depth of the keel 6 varies from zero where it joins the fore part of the
hull a to the full depth of the rudder at the after portion. I prefer to place the
rudder at a distance of one third of the total length of the Vessel from the stern
thereof and terminate the keel at one third the length of the Vessel from the bows,
the ballast should be placed in the central third portion of the Vessel as a less
weight in this position is required than when the ballast is uniformly distributed
over the entire length of the Vessel. I prefer in Iron Vessels to make the keel
of a steel casting or forging of such weight as to act as the necessary ballast.
The bulwarks may enclose only the central portion of the Vessel as shewn or
extend the whole length of the same or to any intermediate distance as desired.
The load line section of the hull forms two segments of circles and the other horizontal
water lines marked W L 2. W. L 3. W. L4. W L 5 are all similar as shewn in half
breadth plan Figure 5. The sides of the Vessel are formed semicircular from the
load line to the main deck as shewn at j.
A spar or hurricane deck may be added if desired in which case I prefer to
surround the main deck and the spar or hurricane deck with a railing instead of
bulwarks. The railing I have found most suitable is one composed of a longitudinal
rail about 4 inches from the deck and another longitudinal rail about 3 or 34 feet
from the deck the intermediate space being filled in with vertical bars spaced about
4 inches apart similar to ordinary iron pallissading, thus preventing children from
climbing on the railing or being washed overboard.
In some cases when bulwarks are used I provide self acting scuppers to allow water
to drain off the deck in case of a large volume of water breaking or falling thereon.
These scuppers are formed of vertical doors pivoted on a vertical axis at a distance of
about to of their total length from one end and open with the longer portion
outwards. The doors are normally kept closed against a watertight seating by a
spring or weight when however a large quantity of water is on the deck the pressure
thereof acting on the longer portion of the door forces it open and so allows the
water to escape. Similarly the force of a wave striking the bulwarks would keep the
scupper doors closed tightly.
Vessels constructed as above do not pitch fore and aft, the Vessel remaining on an
even keel when rising to the waves.
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed 1 declare that what I
claim is :-
Forming the hulls of boats ships and other like Vessels substantially as described
and shewn.
Dated this 7th ..
M
1000