Below: Schematic Diagram of Typical Marine Installation far boats of all sizes and types. ... ENGINEERING CO. scales, parts cand service facilities convenient, prompt cand dependeable Engines ... A number of types of floats were tested to compare their lifting ability while the net was under tow. ... The net, a conventional eastern-style (American) trawl with an 87a#39; groundline, was towed from two davits. ... Wire mesh is used on top and bottom with heavy cotton web for sides and ends.