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Kavipriya Selvam

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Vacuum tube

In 1906, Dr. Lee DeForest (26 Aug 1873 - 30 Jun 1961), one of the “fathers of radio,'' announced his three-element electrical vacuum tube (now known as a triode) to a meeting of the American Institute of Electrical Engineers He had discovered that when a mesh, or grid, of wire was placed between the filament and collector “plate” in a diode tube (first made by J. Ambrose Fleming, 1904), a large voltage-amplifying effect could be produced. DeForest patented this vacuum tube on 15 Jan 1907. The ability of this tube to amplifiy weak signals was an invention as great as radio itself, because it made long-distance communication possible.[Image: early DeForest Audion]

Three men were discussing at a...

Three men were discussing at a bar about coincidences. The first man said, " my wife was reading a "tale of two cities" and she gave birth to twins"
"That’s funny", the second man remarked, "my wife was reading 'the three musketeers' and she gave birth to triplets"
The third man shouted, "Good God, I have to rush home!"
When asked what the problem was, he exclaimed, " When I left the house, my wife was reading Ali baba and the forty Thieves"!!!
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