Calibration of Bell Telephone Laboratories Pressure-gradient Hydrophones Type DTH, Serials 4 and 5 Open PDF Document Details Document Type Technical Report Publication Date May 12, 1961 Accession Number ADA069142 Tags Communities of Interest Air Platforms DTIC Thesaurus Topics Calibration Diameters Free Field Hydrophones Measurement Military Research Pressure Gradients Transducers Underwater Sound