An Improvement in Navigable Vessels.
Year: 1889

page_text: Date of Application, 6th June, 1889
Complete Specification Left. 6th Mar., 1890-Accepted, 12th Apr., 1890
PROVISIONAL SPECIFICATION.
An Improvement in Navigable Vessels.
I, ALEXANDER CLARK, of 37, Lancaster Gate, in the County of Middlesex,
Engineer, do hereby declare the nature of this invention to be as follows:-
My Invention relates to an improvement in navigable. vessels; and has for its.
object to prevent or reduce the rolling and pitching motions of the vessel in a
seaway.
The Invention consists in providing the sides and bottom of the hull with
longitudinal corrugations or ribs projecting from the surface of the hull so as to be
acted on by the rising and falling motions of the waves in such manner that these
opposite motions counteract each other.
This Invention may be carried out in practice either by plating or sheathing the
hull with corrugated sheets of metal, the corrugations extending longitudinally from
stem to stern; or by affixing to the sides and bottom of the hull longitudinal ribs of
Lor Tiron, the said corrugations or ribs being truly horizontal or parallel with the
line of flotation of the vessel.
Dated this fith day of June 1880
COMPLETE SPECIFICATION.
An Improvement in Navigable Vessels.
I, ALEXANDER CLARK of 37, Lancaster Gate in the County of Middlesex,
Engineer, 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 :-
My Invention relates to an improvement in navigable vessels; and has for its
object to greatly diminish the rolling and pitching motions of the vessel in a
seaway.
The Invention consists in providing the sides, or the sides and bottom, of the hull
with longitudinal corrugations or ribs projecting from the surface of the hull so as to
be acted on by the rising and falling motions of the waves in such manner that these
opposite motions will tend to counteract each other.
In the accompanying drawings, forming part of this specification, I have illustrated
various modes in which the invention may be carried out in practice. The several
views are cross-sections of the hull, shewing how the ribs or corrugations project
therefrom, it being understood that in each case they extend longitudinally from stem
to stern or nearly so and are truly horizontal throughout their length, that is to say
parallel to the line of flotation of the vessel so as to offer the least possible resistance
to the progress of the hull through the water.
Figure 1 shews the hall provided with T-shaped ribs formed of angle irons a and
plates 6 rivetted together with distance pieces c between the pairs of plates, the angle
irons being rivetted to the hull. Figure 2 shews similar ribs, but formed by flanging
and bending plates to the desired configuration. Figure 3 shews deeply corrugated
plates rivetted to the hull. In building new vessels, the plates forming the skin of
the hull might themselves be corrugated, instead of applying corrugated plates over
the skin of the ship as shewn in figure 3. Figure 4 is a longitudinal view of the hull,
illustrating the manner in which the waves, acting on the ribs or corrugations towards
the bow and stern, tend to counteract each other.

page_text: It will be understood that I do not limit myself to the particular forms of the ribs
or corrugations shewn, nor as to the number of the said ribs or corrugations which
may be employed, it being obvious that the greater the number the more effective
they will be for the purpose desired and that, as far as rolling motion only is
concerned, they may terminate before reaching the stem or stern, that is to say be
applied only to the broad part of the bull, the ends of the ribs being gradually
tapered off until they merge with the surface of the hull. But, in order to avoid
pitching motion, the ribs or corrugations should be extended from stem to stern.
Having now particularly described and ascertained the nature of the said
invention and in what manner the same is to be performed, I declare that what
I claim is ;-
The application to ships' hulls of longitudinal ribs or longitudinally corrugated
plates, substantially as specified, so as to roughen the outer surface of the hull in the
circumferential direction whilst leaving it smooth in the longitudinal direction whereby
to lessen rolling, or rolling and pitching motions without opposing the progress of the
hull through the water.
VERON
■■DITAAL TIR
ALEXR. CLARK.
By A. M. & Wm. Clark,
53, Chancery Lane, London, Patent Agents.