4 0 c m
actual image size: 24cm x 32cm

"Single sand glass in four pillared wooden mount, 18th century."

"Exton, David"

© Science Museum / Science & Society Picture Library


"Wooden, 55 second sand glass from the second half of the 18th century. Sand glasses were made to measure 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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