Sand timer

Sand timer

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Credit: LAWRENCE LAWRY/SCIENCE PHOTO LIBRARY

Caption: Sand timer. This device is used to measure a set period of time by the flow of sand (blue) from one chamber to the other through a narrow gap.

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Keywords: ancient, chronometry, clock, deadline, device, egg, egg-timer, equipment, glass, hour, hour-glass, hourglass, instrument, limit, measurement, minute, old, old-fashioned, sand, sand-glass, sand-timer, sandglass, science, scientific, time, timer

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