THE SPARK GAP AS AN ACOUSTIC SOURCE Open PDF Document Details Document Type Technical Report Publication Date Oct 30, 1959 Accession Number AD0296381 Entities People James Ricard M. V. Brown Organizations Columbia University Tags Communities of Interest Weapons Technologies DTIC Thesaurus Topics Amplifiers Amplitude Angle Of Incidence Calibration Cathode Followers Electrodes Explosions Explosives Fourier Analysis Frequency Geometry Hydrophones Munitions New York Phase Shift Spark Gaps Time Intervals