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For many years there appeared very little that was new concerning the tests of auditory function. Recently, there has been an awakened interest. This has been brought about largely through the advent of the thermionic vacuum tube or audion bulb. Since this audion bulb has made a contribution to otology, and promises to have a still more extended usefulness, it would seem appropriate to present those features of this bulb that apply to otologic problems. The use of this bulb in providing more precise methods of diagnosis may be regarded as established. In addition, it would not seem too sanguine to hope that the future development of the uses of this bulb may make possible the realization of standardized auditory tests.
The use of the audion bulb is the basis not only of modern radio transmission and reception, but also of long distance telephony. In long distance telephony, two audion
JONES IH, KNUDSEN VO. AUDION BULB CIRCUITS IN OTOLOGIC PRACTICE. Arch Otolaryngol. 1925;2(4):335–339. doi:10.1001/archotol.1925.00570010355002
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