Sand Timer

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

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Size: 4928px × 3264px
Photo credit: © Photo Researchers / Alamy / Afripics
License: Royalty Free
Model Released: No

Keywords: -fashioned, chronometry, clock, glass, hour-glass, hourglass, instrument, limit, measurement, minute, sand, sand-glass, sand-timer, scientific, time, timer