Some Special and Unusual Applications of Barium Titanate in the Underwater Sound Hydro-Engineering and Medical Fields

The advent of ferroelectric materials, especially in the ceramic state, has worked a veritable revolution in the design and production of many equipments. The inpact on certain military arts has been striking; the field of accelerometers has profited well as has the sonar art. The experience of the Naval Air Undersea Warfare effort is outlined as well as several developments of the National Bureau of Standards. The instances cited are examples of widespread military applications. The development of microminiature hydrophones and their use in cardiac diagnosis is also described.