- Improvements in Instruments for Detecting and Measuring Alternating Electric Currents
- GB190424850 (filed: 1904-11-16, published: 1905-09-21)
- ``One century ago, in November 1904, John Ambrose Fleming FRS, Pender Professor at UCL, filed GB patent 190424850 in Great Britain, for a device called the Thermionic Valve. When inserted together with a galvanometer, into a tuned electrical circuit, it could be used as a very sensitive rectifying detector of high frequency wireless currents, known as radio waves. It was a major step forward in the 'wireless revolution.'``
- ``This invention is often considered to have been the beginning of electronics, for this was the first vacuum tube. Fleming's diode was used in radio receivers and radars for many decades afterwards, until it was superseded by solid state electronic technology more than 50 years later.``
