neutrally buoyant float

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neutrally buoyant float (Swallow buoy) A device developed by J. C. Swallow in 1955 for measuring current speed and direction at depth in the oceans. It consists of two aluminium tubes, one containing batteries and sound-generating circuitry, the other containing adjustable weights to allow the device to float and remain at any desired depth. It emits a series of sound pulses which can be tracked by ship, allowing water motions to be measured at selected depths.

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