Colored cardboard discs used by Joseph Henry
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Mary A. Henry
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.181481
label: catalog number
content: 181481
label: accession number
content: 32293
objectType: label: Object Name
content: Discs