Patent model, Brush commutator, US #203,412
date: label: Date made
content: 1878
name: label: maker
content: Brush, Charles F.
notes: label: Description (Brief)
content: Model to accompany the application for US Patent 203412, "Improvement in Magneto-Electric Machines," issued 7 May 1878 to Charles F. Brush. See figure 3 of the patent. This is only the commutator of a dynamo machine, made of four layers of heavy copper segments fastened around a ceramic or terra cotta central core. Each layer has three copper sections, two large and one small, held to the central core with brass flat-head machine screws. Eight copper pins emerge from the top. No extant maker's markings.
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.252650
label: catalog number
content: 252650
label: accession number
content: 49064
label: patent number
content: 203412
objectType: label: Object Name
content: commutator
label: Object Name
content: generator component
label: Other Terms
content: Commutator; Components; Motors and Generators
physicalDescription: label: Measurements
content: overall: 3 1/2 in x 3 in; x 8.89 cm x 7.62 cm