Object Details
- Description (Brief)
- 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.
- Location
- Currently not on view
- Data Source
- National Museum of American History
- maker
- L. E. Knott Apparatus Company
- date made
- ca 1900
- Credit Line
- from Dale F. Kelly
- Measurements
- overall: 4 1/4 in x 14 in x 9 1/4 in; 10.795 cm x 35.56 cm x 23.495 cm
- Object Name
- radio receiver
- coherer
