Abstract: A vise which is constructed of three jaws which are movable to be clamped upon an exterior object, two of the jaws moving in synchronism in respect to another jaw located in a specific position. The movable jaw assemblies are located in an overlapping crossed arrangement. The configuration of the jaws can be altered to grasp not only objects of regular shape, but also objects of irregular shape.

Abstract: A sailboat which includes a hull and a sail assembly with the sail assembly being rotatable with respect to the hull. The rotational axis of the sail passes through the center of the sail so that equal wind force is applied across the sail with respect to the access of rotation of the sail. Rotation retarding structure in the form of a detent or in the form of a frictional drag operates between the sail assembly and the hull. The sail is mounted between a pair of elongated rods with each of the rods being removably secured to a mounting member which is rotatably mounted upon the hull.