Abstract: A system for degaussing ships includes a floating cable having a plurality f insulated conductors, the cable extending between a barge at one end and an end float at the other end, with a floating saddle member mounted at the mid-portion for engagement by a ship's bow. The cable ends are brought together at the barge, the conductors connected in series with one another and energized by a generator on the barge.

Abstract: A ship or other marine surface vessel to be protected against torpedo or missile attack tows therebehind an articulated train of floating projectile barriers. To defense on attack, the ship circles away from the attacker to a position behind a trailing portion of the floating barrier train. Each floating barrier includes a solid wall, torpedo intercepting keel or hull which is buoyant, horizontally stabilized and supports thereon a missile intercepting fence extending above the surface of the water. Provision is made for drawing projectiles to the floating barriers and for determining the position of the attacker.

Abstract: 1. In a torpedo detecting device of the class disclosed, the combination of plurality of hose-like sections, means for coupling the sections end to end to form a single streamer, said streamer including means for receiving and retaining air supplied under pressure thereto and a flutter valve for controlling the admission of the air thereinto, said flutter valve comprising a pair of axially aligned tubular members disposed to provide a chamber, and having axially aligned openings at the opposite ends thereof, a cylinder disposed therein to be movable between the openings in said chamber and in response to a predetermined difference in pressure on opposite sides thereof to shut off the air supplied to the streamer when the pressure differential between the air supplied under pressure thereto and the air under pressure therein exceeds a predetermined value.