A set of four sandglasses in a brass frame, probably 17th century.

Four-way sand glass, Italian, 17th century.
This set of four sand glasses is mounted in a pivoted brass frame so that it can be inverted as required. They measure intervals of a quarter, half, three-quarters and one hour, and are of a type formerly used by preachers for timing their sermons.
Currently on display in:
Measuring Time
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