Sand Glass

A glass of this sort would have been used, in conjunction with a log-line, to determine the speed of a ship. In this example, the sand passes from the upper vessel to the lower in 28 seconds.
Currently not on view
Object Name
half-minute glass
overall: 4 in x 2 7/8 in; 10.16 cm x 7.3025 cm
ID Number
catalog number
accession number
catalog number
See more items in
Medicine and Science: Physical Sciences
Measuring & Mapping
Data Source
National Museum of American History, Kenneth E. Behring Center

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