Radio progress during 1938

This review of progress in radio during 1938 is divided into six parts covering the major fields of Electroacoustics, Electronics, Radio Receivers, Television and Facsimile, Transmitters and Antennas, and Wave Propagation. Part I treats the following maiin divisions of Electroacoustics: theory, loud speakers, microphones, telephone instruments, electromechanical instruments, acoustics of broadcast studios, measurement apparatus and techniques, and electronic musical instruments.