Model of Jacobi direct current motor of 1834
date: label: date made
content: 1903-04-15
name: label: associated person
content: Jacobi
label: maker
content: Jacobi
notes: label: Description (Brief)
content: No extant maker's markings. Sixteen electro-magnets, 2 3/4 inches long, mounted eight each on two wooden supports. One support is fixed (stator) and the other is a rotating disc (rotor). The disc, with magnets attached, is rotated by alternate attraction and repulsion between these magnets and the stationary magnets on the frame. The polarity of the current energizing the moving magnets is reversed at the moment of passing, by means of the commutator on the shaft. This model was made from a description and drawings in Sturgeon's Annals of Electricity, and with the help of copy of these drawings and a model half the size of this borrowed from the Patent Office. Reference: Sturgeon's Annals of Electricity, 1837, vol. 1, page 13. W. James King, Smithsonian Bulletin #228. page 263.
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.215402
label: catalog number
content: 215402
label: accession number
content: 40789
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: 10 1/2 in x 14 1/2 in x 9 in; 26.67 cm x 36.83 cm x 22.86 cm