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Sir John Ambrose Fleming, (born Nov. 29, 1849, Lancaster, Lancashire, Eng.—died April 18, 1945, Sidmouth, Devon), English engineer who made numerous contributions to electronics, photometry, electric measurements, and wireless telegraphy.

John Ambrose Fleming was born in Lancaster, England on the 29th of November 1849. Fleming was the eldest of seven children to his father James Fleming and his mother Mary. His father was a...

Lived 1849 – 1945. In 1904, Ambrose Fleming invented the thermionic diode, a device allowing electric current to flow in one direction only. The invention gave birth to the modern electronic age. Fleming also devised the commony used hand rules for electric motors and generators.

Fleming was knighted in 1929 and died, after a remarkably long and productive life, on April 18, 1945. John Ambrose Fleming was an electronics pioneer who invented the oscillation valve, or vacuum tube, a device that would help make radios, televisions, telephones and even early electronic computers possible.

The work of British scientist John Ambrose Fleming (1849-1945) in inventing the thermionic valve or vacuum tube, arguably laid the basis for modern electronics. The so-called Fleming valve was the first electronic tube device, and was used to detect high-frequency wireless signals.

John Ambrose Fleming was a gifted young electrical engineer living in a boom time of discovery for his field. Born with a hearing impairment that worsened with age, he used the focus it gave him to embrace the era’s opportunities - inventing an electrical device that would change the world.

Sir John Ambrose Fleming (November 29, 1849-April 18, 1945), often called a father of modern electronics, is best known for developing the first successful thermionic valve (also called a vacuum tube, a diode, or a Fleming valve) in 1904.

British Physicist and Electrical Engineer F leming invented the thermionic valve or vacuum tube diode, making possible the rectification or conversion of alternating current into pulsating direct current. The diode was the first reliable rectifier and permitted a vast expansion of radio technology.