Patent model, Keith commutator, US Patent #229,255
date: label: Date made
content: 1880
name: label: maker
content: Keith, Nathaniel S.
notes: label: Description (Brief)
content: Model for US Patent 229255, "Commutator for Magneto-Electric Machines," issued 29 June 1880 to Nathaniel S. Keith. A portland cement drum with four rows of brass sectional plates affixed to the outer surface with steel screws. Each row has two curved plates, each plate being connected to a support rod with the plate's center screw. Eight support rods hold the unit together and provide contact points. Original patent tag with the object.
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.308587
label: catalog number
content: 308587
label: accession number
content: 89797
label: patent number
content: 229255
objectType: label: Object Name
content: Commutator
label: Object Name
content: electrical commutator
label: Other Terms
content: Commutator; Components; Motors and Generators
physicalDescription: label: Measurements
content: overall: 3 in x 4 in; 7.62 cm x 10.16 cm