Abstract
The intrinsic advantages of moving‐coil transducers as low‐frequency, broadband acoustic projectors are discussed, as well as the relative merits of single, large‐scale units versus arrays of smaller units. Recently developed low‐frequency projectors which can be towed behind a ship at significant speeds and depths are shown. The principal areas of study were heat dissipation, coil and coilform configurations, structural design, and magnetic materials. Of particular interest is the use of samarium cobalt magnetic material which offered many more advantages to this field than was originally expected. Several novel approaches to transducer configuration are also shown.
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