Abstract
Electric hearing aids 1 today have become instruments of considerable importance and of many different designs. They may be for large audiences in theaters, schools, churches and auditoriums or for small groups in homes and offices. All of these use line current and are generally stationary. However, most instruments now are designed for individual use and only for the use of one individual, are of vest pocket size, use battery current and are wearable. For the last two years, these wearable instruments have been built with small (peanut size) radio tubes and crystal microphones. This is the most radical change in hearing aids since 1932. The development and refinement of the electric hearing aid and the modern radio receiving set both began in 1922. The former has followed the latter quite closely in many ways and has been to a considerable degree dependent on it. Alexander Graham Bell's original electric
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