"A sounding-board over a pulpit or rostrum, designed to reflect the speaker's voice downward toward the audience, or in any desired direction."-Wright, 1902

Abat-voix

"A sounding-board over a pulpit or rostrum, designed to reflect the speaker's voice downward toward…

"To illustrate roughly the passage of air through the glottis, force air through such a tube by blowing hard, and if the strips are not too far apart a sound will be produced. The sound will vary in character as the bands are made tight or loose." — Blaisedell, 1904

Air Passage

"To illustrate roughly the passage of air through the glottis, force air through such a tube by blowing…