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Aztec Asphalt

Aztec Asphalt

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Usage conditions apply
Currently not on view
Object Name
mechanical calculating disk
Physical Description
cellulose nitrate (overall material)
ferrous metal (frame material)
overall:.8 cm x 10 cm; x 5/16 in x 3 15/16 in
overall: 1/2 in x 4 in; 1.27 cm x 10.16 cm
ID Number
catalog number
accession number
See more items in
Medicine and Science: Chemistry
Data Source
National Museum of American History
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