Page 11 - அருங்காட்சியகம் ஆஃப் வரலாறு News Today : Breaking News, Live Updates & Top Stories | Vimarsana

From sci-fi to Wi-Fi to my-wi : the future is here Credit: Zhenqing Du In 1965 my dad brought home a transistor radio from the television factory where he worked. At home, we still had the stately valve-amp radiogram that took up half the parlour, where my mother had listened to Churchill’s radio broadcasts while my dad was fighting in the war. As a small child in the 1960s, I liked to sit behind the humming radiogram, watching the orange glow of the glass valves. It was fairy-like and warm. Those valves, as the Brits called them, were vacuum tubes. They were invented in Britain, in 1904, by John Ambrose Fleming – really as a spin-off from the incandescent light bulb, a filament inside an evacuated glass container. When hot, the filament releases electrons into the vacuum; it’s called the Edison Effect (technical term, thermionic emission). Thomas Edison had invented the lightbulb in 1879, and Ambrose realised that if he put a second electrode into a similar evacuated envel

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