Thomson dynamo-electric machine, patent #233,047
date: label: Date made
content: ca 1880
label: date ordered, given, or borrowed
content: 1908 07 18
name: label: licensee
content: Thomson, Elihu
label: maker
content: Thomson, Elihu
notes: label: Description (Brief)
content: A patent model for a direct current generator. See US Patent # 233047, Dynamo-Electric Machine, issued 5 October 1880 to Elihu Thomson. Claim: A combination of magnetizing coils surrounding and surrounded by iron masses, placed so as to utilize both the internal and external magnetizing effects of the coils which surround and magnetize both the field-magnet poles and the 3 layer armature. Wooden base carries an iron frame, end pieces of which are held together by numerous iron rods. Field magnets at each end are painted red. Spherical armature with pole at one end, commutator and brushes at the other. This is a model of the early type of Thomson machine, which was used in electric lighting. 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.252662
label: catalog number
content: 252662
label: patent number
content: 233047
label: accession number
content: 49064
objectType: label: Object Name
content: electrical generator
label: Other Terms
content: Generator; Motors and Generators
physicalDescription: label: Physical Description
content: black (frame color)
label: Physical Description
content: brown (base color)
label: Physical Description
content: red (coils color)
label: Physical Description
content: metal, iron (frame material)
label: Physical Description
content: wood (base material)
label: Measurements
content: overall: 6 1/2 in x 8 3/4 in x 11 3/4 in; 16.51 cm x 22.225 cm x 29.845 cm