1. An acoustic decoy adapted to operate underwater, said decoy comprising a motor means, a circular spindle means connected to said motor means and adapted to be rotated thereby, said spindle means having a pair of axially aligned spaced parallel discs, a plurality of radially extending sockets formed in the periphery of each disc with the sockets of respective discs being in axial alignment with each other, a roller comprising a shaft slidably and loosely supported within each pair of aligned sockets, each of said rollers comprising a pair of hammers on the associated shaft, and a casing means surrounding said spindle means, on the sides and one end thereof, said casing means comprising a cylindrical casing concentric with the axis of rotation of said spindle means, said sockets terminating radially inwardly from said casing a distance sufficient to receive the associated shaft with its hammers spaced from said casing when said spindle means is not rotating, whereby said hammers are moved by centrifugal force to impinge against the sides of said casing whenever the spindle is rotated.
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