Hour glass

Hour glass

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Credit: GEORGE BERNARD/SCIENCE PHOTO LIBRARY

Caption: Hour glass. Illuminated manuscript of an hour glass in mid-flow. This instrument is used to measure a fixed period of time, by allowing a fixed amount of sand to flow through a narrow gap between two chambers. This hour glass dates from the mid-17th century. From a book of 1843.

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Keywords: 1600s, 17th century, device, equipment, historical, history, hour glass, hour-glass, hourglass, illuminated manuscript, illustration, instrument, measurement, measuring, one, sand, science, scientific, single, time, timer, timing

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