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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Creative#:
TOP10190270
Source:
達志影像
Authorization Type:
RM
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須由TPG 完整授權
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N/A
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No
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