Hourglass

Hourglass

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Credit: SHEILA TERRY/SCIENCE PHOTO LIBRARY

Caption: Hourglass. Grains of sand fall from the upper to the lower glass bulb, measuring a fixed length of time. Hour glasses were first used by the Romans in about 1 BC.

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Keywords: device, egg-timer, equipment, grains, hourglass, instrument, measurement, sand, science, scientific, scientific instrument, time

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