Wallace-Edmonds arc light dynamo
date: label: date made
content: 1879
name: label: maker
content: Wallace & Sons
notes: label: Description (Brief)
content: Electric light machine producing either alternating or direct current. No extant maker's markings. This machine has a round type frame with external winding of what appears to be a stationary armature. In his short biography of William Wallace, William J. Hammer concludes that this machine was constructed with a double-wound Gramme ring, with two commutators and a circular field enclosing the armature. However, examination of the specimen reveals that the external winding has radial leads that end in terminal screws on the commutator strips. This would definitely indicate a fixed armature. In addition, slip rings are located on either side of each commutator, apparently for production of AC currents. Copper wire brushes are badly bent. A coupling wheel is providing on one end of the rotating field shaft. This machine was constructed in 1879 with the assistance of Henry Edmonds who was at that time in Wallace's employ. Reference: W. J. Hammer, William Wallace and his Contributions to the Electrical Industries, 1893.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Coe Brass Manufacturing Co.
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.181646
label: catalog number
content: 181646
label: accession number
content: 32363
objectType: label: Object Name
content: generator
label: Object Name
content: dynamo
physicalDescription: label: Measurements
content: overall: 26 in x 28 in x 18 in; 66.04 cm x 71.12 cm x 45.72 cm