Knott Gilley-Gramme-type direct current demonstration apparatus
date: label: date made
content: ca 1912
name: label: associated person
content: Gilley
label: maker
content: Gilley
label: maker
content: Central Scientific Company
label: maker
content: L. E. Knott Apparatus Company
notes: label: Description (Brief)
content: Electromagnetic Demonstration Apparatus. Gilley motor with both Gramme and solenoidal armature. A demonstration apparatus for laboratory purposes, showing principles of the dynamo generator and motor. A solenoidal or a Gramme type armature may be inserted between the curved poles of a field electromagnet. Binding posts are on the frame for input voltage to the field coil and voltage input to the armature through two brushes. There's also a Brownlee 2-pole armature unit with this machine. One can remove the Gramme disc and replace it with the Brownlee armature. Marked: L. E. Knott Apparatus Co., Scientific Supplies, Boston, Mass. Reference: Knott Catalog, 1912, https://www.sil.si.edu/DigitalCollections/trade-literature/scientific-instruments/files/51733/imagepages/image496.htm; CENCO Catalog J-300 page 716. Audel's New Electric Library, Vol I, Chapter 16 (pages 303-320).
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from the University of Maryland
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.318290
label: catalog number
content: 318290
label: accession number
content: 233572
objectType: label: Object Name
content: Motor
label: Object Name
content: electric motor
label: Other Terms
content: Motor; Electromagnetic Devices; Magnetic Devices; Electromagnetic Devices
physicalDescription: label: Measurements
content: overall: 3 1/2 in x 7 1/2 in x 8 in; 8.89 cm x 19.05 cm x 20.32 cm
label: Measurements
content: two-pole armature: 2 3/4 in x 4 1/4 in x 1 1/4 in; 6.985 cm x 10.795 cm x 3.175 cm