Abstract: A ship according to the present invention comprises an inner hull plating (1) and an outer hull plating (2) connected together solely by transverse bulkheads (4) and connecting longitudinal members (3) fixed to the bulkheads (4). Each bulkhead 4 comprises a rectangular double plate central portion and a rectangular ring form box (11) surrounding the central portion. The box (11) includes a flaring part (11a) internally provided with generally triangular ribs (10) and a peripheral part (11b) of a constant thickness receiving part of the connecting longitudinal members (3).

Abstract: A ship having at least its side portions and bottom portion comprised of a double hull construction consisting of an inner hull plating and an outer hull plating connected together solely, except for transverse bulkheads disposed in spaced apart relation in the lengthwise direction of the ship, by a plurality of connecting longitudinals fixed to the bulkheads, at least one of the connecting longitudinals having anti-buckling means extending in the lengthwise direction thereof and tripping means extending in the widthwise direction thereof. According to this arrangement, external forces exerted on the ship may be transmitted through the connecting longitudinals to the transverse bulkheads so that the inner and outer hull platings may be protected from buckling. The absence of transverses crossing the longitudinals considerably facilitates the automatization of welding operation.

Abstract: The present application discloses a first-order balancer of an internal combustion engine comprising forward-rotating fly-wheels fitted on both ends of a shaft and allowed to rotate in the same direction as said shaft, backward-rotating fly-wheels fitted respectively on said both forward-rotating fly-wheels and allowed to rotate in the opposite direction from said both forward-rotating fly-wheels, forward-rotational counterweights placed on said both forward-rotating fly-wheels, and backward-rotational counterweights placed on said both backward-rotating fly-wheels and having a different weight from said both forward-rotational counterweights. According to the first-order balancer of an internal combustion engine of the present invention, vertical and horizontal first-order unbalanced moments arising in an internal combustion engine may be simultaneously balanced.