OPEIDOSCOPE

Etymology

Noun

opeidoscope (plural opeidoscopes)

An instrument, consisting of a tube with one end open and the other end covered with a thin flexible membrane with a mirror attached to its centre, used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds that enter the tube.

Source: Wiktionary

O*pei"do*scope, n. Etym: [Gr. -scope.] (Physics)

Definition: An instrument, consisting of a tube having one end open and the other end covered with a thin flexible membrance to the center of which is attached a small mirror. It is used for exhibiting upon a screen, by means of rays reflected from the mirror, the vibratory motions caused by sounds produced at the open end of the tube, as by speaking or singing into it. A. E. Dolbear.

Source: Webster’s Unabridged Dictionary 1913 Edition

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