Conflicting reports in the literature as to the value of the "aural" or "acoustic" method of treating deafness have stimulated us to make a careful investigation of a recent device constructed on the principle of the radio.
Urbantschitsch,1 of Vienna, in the early nineties made what was probably the first systematic attempt at "auditory reeducation," or stimulation by means of sounds. He used the voice and accordion to accomplish this reeducation. Other experimenters have used sirens, phonographs, diapasons and other instruments, usually musical, with indifferent results.
In 1910 Zünd-Burguet,2 of Paris, described an instrument, devised by him, actuated by an electric current of from 4 to 6 volts and containing three organs producing tones with harmonics similar to and within the range of the human voice. The pitch and intensity of the sounds produced could be regulated. Transmission of the sounds to the ear was accomplished by
BALLENGER HC, PATTERSON BA. "AURAL" OR "ACOUSTIC" METHOD OF TREATING DEAFNESS. Arch Otolaryngol. 1935;22(4):410–415. doi:10.1001/archotol.1935.00640030426002
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