Sand Glass

Description
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.
Location
Currently not on view
Object Name
half-minute glass
Measurements
overall: 4 in x 2 7/8 in; 10.16 cm x 7.3025 cm
ID Number
PH*337068
catalog number
337068
accession number
1980.0229
catalog number
1980.0229.01
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Medicine and Science: Physical Sciences
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Data Source
National Museum of American History, Kenneth E. Behring Center

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