Sand glasses, 18th century.
3 0 c m
actual image size: 32cm x 22cm

Sand glasses, 18th century.

Exton, David

© Science Museum / Science & Society Picture Library


Wooden sand glasses from the second half of the 18th century, each is in a four or five pillared wooden mount. Each sand glass measures out a specific length of time. They were used at sea to time a ship's 'watch', or to calculate the ship's speed.



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