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Four-way sand glas, Italian, 17th century.

Hills, Jennie

Four-way sand glas, Italian, 17th century.
3 3 c m
actual image size: 32cm x 25cm


This four-way sand glas in a bras stand was hung on a wall so that the glases could be inverted as required. They measure intervals of quarter, half, three-quarters and one hour, and are of a type formerly used by preachers for timing their sermons. The earliest known illustration of a sand glas is a large fresco of 1337-9 depicting 'Good Government' by Ambrogio Lorenzetti (c 1280-1348) in the 'Palazzo Publico' in Siena, Italy.

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© Science Museum / Science & Society Picture Library

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