Century Dictionary and Cyclopedia
- n. An instrument for illustrating sound by means of light. It consists of a membrane upon which is a mirror. When the membrane is caused to vibrate by a sound, as that of the voice, the mirror exhibits this vibration on a screen by means of the movements of a ray of light reflected from it.
- n. 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.
GNU Webster's 1913
- n. (Physics) 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.
- Ancient Greek (Wiktionary)
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