The Fleming Oscillation Valve by British scientist John Ambrose Fleming as a detector for early radio frequencies used in electromagnetic wireless telegraphy. It was the first practical vacuum tube, as well as the first thermionic diode, which is a vacuum tube that conducts current in one direction while blocking current in the other. The invention by Fleming is now included in the IEEE's List of Electrical Engineering Milestones because the IEEE regards it as one of the most significant accomplishments in electronic history.
US Patent Number: 803,684
Invention: Fleming Oscillation Valve (Instrument for Converting Alternating Electric Currents into Continuous Currents)
Inventor: J. A. Fleming
Year: 1905
Material: Ink on Japanese museum-quality archival paper. Thickness of paper: 10.3 mil (0.26 mm). Weight of paper: 5.57 oz/yd² (189 g/m²)
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