Device Bares Vocal Chords (Feb, 1938)

Device Bares Vocal Chords
CONSISTING of an intricate maze of hidden mirrors in a long, slender metal tube, one end of which is inserted into the mouth far back toward the throat, an “auto-phonoscope” device enables voice teachers to peer at pupils’ vocal chords while they are in action. Tiny, but powerful, electric bulbs at the tip of the tube provide light within the pupils throat during the examination.

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