Knott "Branley" coherer wireless demonstration apparatus
date: label: date made
content: ca 1900
name: label: maker
content: L. E. Knott Apparatus Company
notes: label: Description (Brief)
content: Mahogany base mounting a glass tube containing iron filings -- a brass cased striker, a sounder, and relay. Marked "L.E. Knott Apparatus Co., 16 Ashburton Place, Boston, Mass." When a radio signal passes through the tube, the metal filings "cohere" or link together, closing an electrical circuit. Tapping the tube causes the filings to disassociate, opening the circuit. This was one of the earliest forms of radio signal detectors.
label: Location
content: Currently not on view
place: label: place made
content: United States: Massachusetts, Boston
setName: label: See more items in
content: Work and Industry: Electricity
creditLine: label: Credit Line
content: from Dale F. Kelly
dataSource: label: Data Source
content: National Museum of American History
identifier: label: ID Number
content: EM.314246
label: catalog number
content: 314246
label: accession number
content: 195336
objectType: label: Object Name
content: radio receiver
label: Object Name
content: coherer
physicalDescription: label: Measurements
content: overall: 4 1/4 in x 14 in x 9 1/4 in; 10.795 cm x 35.56 cm x 23.495 cm