Davis revolving rectangle
date: label: date made
content: ca 1850
name: label: maker
content: Davis, Jr., Daniel
notes: label: Description (Brief)
content: Magnet poles engraved "N" & "S"; on the outside in gold and black letters: "DANIEL DAVIS JR.", S, "BOSTON, MASS". A demonstration instrument with a turned mahogany base on which is mounted a vertical horseshoe-form magnet. Lower end of magnet painted red, pole ends bridged with a brass strap. Brass binding posts extend to the outside, connected to silver commutator brushes (missing) that contact the axle above a rectangular coil of insulated wire, painted green outside and red inside. Commutator with cone and cup bearings. Tensioning screw set on top of bridge. See Daniel Davis, "Manual of Magnetism", (Boston, 1842) pages 98, 99, figure 69. Davis claimed the coil in this unit could rotate at 8 to 10,000 rpm.
label: Location
content: Currently not on view
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from University of Georgia
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: 1988.0288.01
label: accession number
content: 1988.0288
label: catalog number
content: 1988.0288.01
objectType: label: Object Name
content: magnetic apparatus
label: Object Name
content: magneto motor
physicalDescription: label: Measurements
content: overall: 13 1/8 in x 7 1/2 in x 5 1/8 in; 33.3375 cm x 19.05 cm x 13.0175 cm