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To the Editor:—I tested my associates and myself by first using the Bárány noise apparatuses in each ear and then blowing air into the ear by means of a stethoscope, sending a current of compressed air against the open end of the stethoscope. By this method it is quite true that with the Bárány noise apparatus in each ear one can still hear the heavy sounding fork placed against either mastoid. When the current of air is sufficiently strong, however, the fork is not heard. It seems to be a question of the degree of noise, because when the current of air is not very strong, the fork is heard. In other words, a strong current of air blown against the drum membrane is a more efficient noise apparatus than the Bárány apparatus. As we did not have a case of total unilateral deafness at hand, we could not
SONNENSCHEIN R. "TESTING FOR PERCEPTIVE DEAFNESS". Arch Otolaryngol. 1932;15(4):634. doi:10.1001/archotol.1932.03570030653018
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