throat-mirrors

Updated: May 1, 2025

Moreover, this objection does not apply equally to electric light, now so much used. This illustration is meant to show more especially the relative position of observer and observed. The observer, on the right, is wearing the head-mirror, while two throat-mirrors seem to be in position in reality, the same mirror in two different positions.

Wesley Mills - Voice Production in Singing and Speaking: Based on Scientific Principles (Fourth Edition, Revised and Enlarged)