Meaning of opeidoscope | Babel Free

Definitions

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.

Examples

“Among many experiments in transmitting speech I tried that of a conical point of iron fastened to the middle of an opeidoscope membrane, the point being attached to a fine wire in such a manner as not to interfere with its freedom of movement […]”

“This is a modification of the opeidoscope. A thin membrane of goldbeater's skin or rubber is stretched over a wooden or metallic cell and secured by a winding of thread. To the center of the membrane is cemented a small thin mirror.”

“I can't help thinking that, had he lived to see the electronic cricket sensor, the inventor of the opeidoscope probably would have approved.”

CEFR level