Replica of Henry's DC electro-magnetic motor
date: label: Date made
content: ca 1890
name: label: associated person
content: Henry, Joseph
label: maker
content: Model Shop, United States National Museum
notes: label: Description (Brief)
content: Replica of Joseph Henry's Rocking Electro-Magnetic motor of 1831. Markings: "N" for North Pole on each bar magnet. Replica of a machine made by Joseph Henry in 1831, that represents a successful attempt to apply power from his electromagnet for the purpose of producing mechanical motion. One battery cell is at each end, with mercury cups into which connecting wires alternately dip. The movable electromagnet, supported on a horizontal axis, was alternately attracted and repelled by two permanent magnets as the polarity of the electromagnet was affected by dipping the wires into cups of mercury connected to the battery circuit.
label: Description (Brief)
content: This replica may have been made for the Chicago Exposition of 1893, but evidence from the accession papers is not conclusive. In 1909, it was one of a number items from the United States National Museum shown at the Alaska-Yukon-Pacific Exposition. Reference: W. James King, "US National Museum Bulletin #228," pages 260-261.
label: Description (Brief)
content: <i>Exhibits of the Smithsonian Institution and the United State\ National Museum at the Alaska-Yukon-Pacific Exposition, Seattle, Washington, 1909</i> (Washington, 1909), 21.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.244904
label: accession number
content: 46812
label: catalog number
content: 244904
objectType: label: Object Name
content: Motor
label: Object Name
content: electric motor
label: Other Terms
content: Motor; Motors and Generators
physicalDescription: label: Measurements
content: overall: 9 in x 20 in x 6 in; 22.86 cm x 50.8 cm x 15.24 cm