Boston Public Library
Exhibitions

Atlantic Neptune Part 1 – Item 23 of 23

sandglass
30 minute glass, ca. 1900. Glass, wood, sand.
Courtesy USS Constitution Museum. USSCM Cat. #176.1
The 30 minute sand glass, also called a watch glass, was used to measure the time at sea. The glass would be turned every half hour, and was used in conjunction with the ship’s bell.

 

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