stroboscope


stro·bo·scope

noun \ˈstrō-bə-ˌskōp\

Definition of STROBOSCOPE

:  an instrument for determining the speed of cyclic motion (as rotation or vibration) that causes the motion to appear slowed or stopped: as
a :  a revolving disk with holes around the edge through which an object is viewed
b :  a device that uses a flashtube to intermittently illuminate a moving object
c :  a cardboard disk with marks to be viewed under intermittent light

Origin of STROBOSCOPE

Greek strobos whirling + International Scientific Vocabulary -scope
First Known Use: 1896

stroboscope

noun    (Concise Encyclopedia)

Instrument that repeatedly illuminates a rotating or vibrating object in order to study the motion of the object or to determine its rotation speed or vibration frequency. The effect is achieved by producing light in very short bursts timed to occur when the moving part is in the same phase of its motion. By use of the stroboscope, a machine part, for example, may be made to appear to slow down or stop.

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