A Reactance Tube Circuit for Measuring Purposes Applicable to Microphone Calibration. Document Details Document Type Technical Report Publication Date Jan 01, 1951 Accession Number ADA953101 Entities People H. E. Von Gierke W. W. Von Wittern Tags DTIC Thesaurus Topics Calibration Communication Equipment Electrical Impedance Electrical Properties Electricity Electroacoustic Transducers Impedance Laboratory Procedures Microphones Reactance