COMPASS DIAL BEARING INDICATOR FOR ACOUSTIC SIGNALS Open PDF Document Details Document Type Technical Report Publication Date Feb 22, 1954 Accession Number AD0028818 Entities People S. N. Heaps Tags Communities of Interest Energy and Power Technologies DTIC Thesaurus Topics Acoustic Propagation Acoustic Signals Amplifiers Amplitude Circuits Detectors Dynamic Range Electrical Circuits Electronic Amplifier Frequency Magnetic Fields Measurement Sound Waves Stiffness Test And Evaluation Underwater Sound Waves