In early 1944, I got a job in the Columbia University Divi sion of War Research, to work on sonar. My boss, Henry Primakoff, asked me to help him analyze the scattering of sound by a dome. This is a thin, streamlined aluminum shell, which surrounds a projector. The projector emits a pulse of sound waves, and then acts as a hydrophone to detect any waves… (More)
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