LOW-FREQUENCY HYDROPHONE CALIBRATION SYSTEM Document Details Document Type Technical Report Publication Date Nov 14, 1956 Accession Number AD0130706 Entities People H. Gerber J. Radford Organizations Naval Ordnance Laboratory Tags DTIC Thesaurus Topics Acoustic Detectors Acoustic Equipment Calibration Detectors Electroacoustic Transducers Frequency Hydrophones Laboratory Procedures Measurement Transducers