Abstract: A submersible rotatable cage for fish farming comprises a central axle, a buoyant structure positioned about the central axle, and a netting attached to the buoyant structure. An actuator can be placed in operable communication with at least part of the buoyant structure to facilitate rotation of the buoyant structure about the central axle while the cage is in a submerged position. The cage can form part of a system, which includes a net cleaning apparatus, a tethering mechanism and sweep net, that forms the basis for underwater fish farming.

Abstract: A submersible rotatable cage for fish farming comprises a central axle, a buoyant structure positioned about the central axle, and a netting attached to the buoyant structure. An actuator can be placed in operable communication with at least part of the buoyant structure to facilitate rotation of the buoyant structure about the central axle while the cage is in a submerged position. The cage can form part of a system, which includes a net cleaning apparatus, a tethering mechanism and sweep net, that forms the basis for underwater fish farming.

Abstract: A submersible rotatable cage for fish farming comprises a central axle, a buoyant structure positioned about the central, a netting attached to the buoyant structure and an actuator in operable communication with at least part of the buoyant structure and adapted to facilitate rotation of the buoyant structure about the central axle while the cage is in a submerged position. The cage can form part of a system, which includes a net cleaning apparatus, a tethering mechanism and sweep net, that can be used for nearly complete underwater fish farming.

Abstract: A submersible rotatable cage for fish farming comprises a central axle, a buoyant structure positioned about the central, a netting attached to the buoyant structure and an actuator in operable communication with at least part of the buoyant structure and adapted to facilitate rotation of the buoyant structure about the central axle while the cage is in a submerged position. The cage can form part of a system, which includes a net cleaning apparatus, a tethering mechanism and sweep net, that can be used for nearly complete underwater fish farming.

Abstract: A system, preferably a pulse echo reflection system, for residual tire life prediction by ultrasound includes: a transmitter transducer; means to provide pulses of electrical energy to the transmitter transducer, that converts the electrical pulses into pulses of ultrasonic vibrations and transmits them into an area of the plycontaining portion of the carcass of a tire, having a number of plies in the carcass, to be tested; clock means to control the frequency of the electrical pulses; a receiver transducer mounted relative to the transmitter transducer to receive ultrasonic energy reflected by the tire; amplifier means connected to the receiver transducer to receive reflected ultrasonic energy from different levels within that portion of the carcass of the tire, including reflected ultrasonic energy from plies of the carcass of the tire; processing means having an input connected to the amplifier; and gate means responsive to the clock means to provide, after a delay following each electrical pulse, a time-g