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The Harvard Underwater Sound Laboratory was operated by the University from 1941 to 1949 under contract to the National Defense Research Committee/Office of Scientific Research and Development. Research at the Lab focused on the improvement of equipment for the detection of underwater sound and the design of new equipment. The records document experiments, apparatus, and Lab administration. Topics include underwater acoustics and sonar.
The Radio Research Laboratory (RRL) was established in 1942 to develop countermeasures to radar. These records document research projects. Topics include radar, radar countermeasures, microwaves, research methodology, and the relationship of federally-sponsored research to the industrial sector.