Abstract: A roller-type electric motor includes a housing having a hollow interior and an inner wall. A plurality of stator poles each of predetermined magnetic polarity are positioned at the inner wall of the housing, and a roller having an outer surface is positioned for rolling movement within said hollow interior of the housing. A plurality of roller poles each of predetermined magnetic polarity are positioned on the outer surface of the roller so that a first one of the roller poles has a magnetic polarity opposite the magnetic polarity of a first one of the stator poles so that the first roller pole is drawn through magnetic action into contact with the first stator pole.

Abstract: The present invention relates to an underwater weapon having a barrel with n opening through which a projectile is discharged. The weapon further has an apparatus for pressurizing the interior of the barrel to a pressure greater than the ambient pressure to keep water from entering the gun barrel at any point around the circumference of the muzzle opening. The pressurizing apparatus includes a source of gas, a pressure regulator for adjusting the flow of the gas and the pressure within the barrel, and a distribution network for distributing the gas near the muzzle opening and at an end of the barrel remote from the muzzle opening.

Abstract: A pump having a stator that forms a cylindrical chamber defined by a wall d a plurality of independently energizable magnetic field generators. A compression roller comprising a magnetic material is disposed within the wall and is free to move with respect to the stator. A flexible diaphragm is intermediate the stator and the compression roller and disposed along the wall portion. The flexible diaphragm to be pumped has an input port and an outlet port for the fluid being pumped. An energizing control at any given instant energizes a plurality of adjacent ones of the magnetic field generators. The magnetic field generators are organized into overlapping sets that can be energized as sets in sequence thereby to produce a rotating, axially extending magnetic field within the wall. The compression roller follows the rotating field thereby to compress adjacent positions of the flexible diaphragm to pump fluid from the diaphragm through the inlet port to the outlet port.