Improvements in or connected with the Construction of Boats.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improvements in or connected with the Construction of Boats.
I, JOHN IRELAND BOOKER, of 57, Tong Road, Leeds, in the County of York,
Engineer, do hereby declare the nature of this invention to be as follows:-
This invention has reference to the construction of boats from sheets of metal
or other substances capable of being pressed or worked to the shapes required, and
the object is to construct the said boats in such a manner that they may be made
lighter and stronger than pressed metal boats hitherto manufactured; whilst at
the same time the said boats are as buoyant as wood boats, should they become
swamped or filled with water.
According to my invention, I form the boat of an outer shell formed from two
sheets of metal or other substance capable of being pressed or worked to the
required shapes; and the said plates are formed with corrugations, ridges or
indentations, which run longitudinally along the sections, and which may take
the form and appearance of the exterior of a clincher-built boat. An interior
shell, composed of two or other suitable number of sheets of metal or other sub-
stance, is pressed or otherwise worked to the shape of the interior of the boat,.
and corrugations, ridges or indentations are formed transversely in the said
interior shell, the exterior plane of the corrugations of the interior shell being
preferably of such a curve and size as to fit against the interior surface of the
corrugations of the outer shell, when the said shells are placed together. Both
the sections of the inner and outer shells are formed with flanges running round
the base and ends, and the four sections may thus be clamped together through the
flange and welded or otherwise secured together; an additional keel plate being
employed if desired.
It will be readily seen that the corrugated form of the plates, enables the same
to be taken up where required without unduly straining or drawing the material;
and the plates when secured, form a boat having a double shell which renders it
practically unsinkable, as two separate watertight compartments are formed which
are distributed evenly over the entire surface of the boat. The longitudinal
corrugations give great strength to bear any end strain on the boat, and the
transverse corrugations strengthen the boat to resist pressure or strain on the
sides.

page_text: Improvements in or connected with the Construction of Boats.
I, JOHN IRELAND BOOKER, of: 57, Tong Road, Leeds, in the County of York,
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: --
This invention has reference to the construction of boats from sheets of metal
such as mild steel or other suitable substances capable of being pressed by lies
or otherwise worked to the shapes required and the object is to construct the
said boats in such a manner that they will be lighter and stronger than pressed
metal boats hitherto manufactured) and will at the same time be as buoyant as
wooden boats, even when swamped or filled with water.
The accompanying drawings illustrate a sheet metal boat according to this
invention, Fig. 1 being a side elevation; Fig. 2 a longitudinal section on the
line a a Fig. 3; and
Fig. 3 is a transverse section.
a is an outer shell formed from two sheets or plates. of. metal pressed or worked
to the required shape; the said plates are formed with longitudinal corrugations,
ridges and indentations which may be so formed that the boat will resemble out-
wardly a clincher-built boat. Within the shell a is fitted an inner shell 6 com-
posed of two or other suitable number of sheets of metal pressed or otherwise
worked to the required internal shape of the boat, the shell 6 is formed with
corrugations, ridges or indentations running transversely or approximately at
right angles to those on the outer shell. The exterior of the inner-shell is prefer-
ably so curved and of such a size as to fit snugly within the outer shell when the
two shells are placed together, the outwardly projecting portions of the corru-
gations of the inner shell abutting against the inwardly projecting portions of
the corrugations of the outer shell. The side portions or sections of the inner
and outer shells b, a are formed with flanges c, c¹ respectively, said flanges run-
ning round the base or keel-portion and the ends or stem and stern portions of
the sheets or plates. The four sections are clamped in position and the flanges c
and c welded or otherwise secured together, an additional keel plate being
employed, if desired.
The upper portion of each shell may be formed with a trough like recess; the
recessed part of the outer shell being concave internally and the recessed
part d. of the inner shell being concave externally so that, when the shells are
secured together, there is formed 'near the gunwales of the boat a pair of tubular
watertight chambers, Fig. 3; the gunwales proper are formed by flanges on
the two shells, said flanges extending upwardly above the parts d'and d¹ and being
welded or otherwise jointed together.
It will be readily seen that the corrugated form of the plates forming, the
shells a and b enables the same to be pressed or otherwise formed or bent to
shape without the metal being buckled or unduly strained. The plates, when
secured together, form a practically unsinkable boat having a double shell between
which are formed two separate water-tight compartments which are distributed
over the entire surface of the boat, i.e. extend from keel to gunwale and
from stem to stern. These compartments or chambers may be filled with cork
or other buoyant material.
The longitudinal corrugations give great strength to withstand strains tending
to bend the boat and the transverse corrugations enable the boat to resist pressure
or strain tending to bulge in its sides at: any point.

page_text: Boats according to this invention may be fitted with seats or thwarts, each of
which may consist as illustrated in Fig. 2 of a trough-shaped sheet-metal lower
portion e, which may have its edges flanged as shown, and an upper portion or
Cover el attached thereto.. The lower portion e may in some cases be formed
of two plates having their lower parts inclined towards each other and bolted
or otherwise secured together. These plates may be made to fit the inner shell
to which they may be secured, if desired.
The inner shell may be pressed to the required form from one plate of metal,
in which case the flanges c would be dispensed with, the flanges c', c¹, of the
outer shell being welded or otherwise secured to each other.
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:-
1. A boat comprising an inner shell formed with transverse corrugations, ridges
or indentations and an outer shell formed with longitudinal corrugations, ridges
or indentations, said inner and outer shells being so arranged and secured together
as to form one or more watertight compartments between them, substantially as
described.
2. A boat of the kind referred to in the preceding claim constructed as
described with reference to and shown in the accompanying illustrative drawings.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.
For the Applicant,
W. LLOYD WISE,
46, Lincoln's Inn Fields, London, W.C., Chartered Patent Agent.