RD Supekar 12th Computer Science Textbook PDF Download | Handy Notes
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Download 12th Question Bank With Solutions
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RD Supekar 11th Computer Science Textbook PDF Download | Handy Notes
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Tungsten Filament
Langmuir improves the lightbulb's core. In modern culture, the lightbulb is the symbol we o…
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Turbocharge
"From backyard tuners to luxury limousine manufacturers, they've all relied on Buchi's…
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Valve Diode
Fleming invents the first true electronic device (1904) When British electrical engineer John Ambr…
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Contact Lenses
Fick, Kalt and Muller aid vision correction (1887) "A pair of powerful spectacles has someti…
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Answering Machine
Poulsen develops a solution for missed phone calls ( 1904 ) Dane Valdemar Poulsen ( 1869-1942 ) s…
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Automatic Transmission ( 1904 ) | Sturtevant renders gear sticks superfluous
The Sturtevant family business was founded in 1883 by Thomas L. Sturtevant, with the aim of satisf…
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Tea Bag ( 1903 ) | Sullivan accidentally discovers a way to brew an instant cup of tea
Eager to boost orders for his teas, New York tea merchant Thomas Sullivan devised a new method of …
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AC Electric Power (1888) | Tesla delivers cheaper, more reliable electricity
"Alternating current is like a torrent rushing violently over a precipice." Thomas Ediso…
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Powered Airplane ( 1903 ) | The Wright brothers build the first winged aircraft capable of sustained flight
"For some years I have been afflicted with the belief that flight is possible to man." W…
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Electricity Meter (1888) | Shallenberger's meter supplies AC power
"Faith is like electricity. You can't see it, but you can see the light" Unknown aut…
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Glass Bottle-making Machine ( 1903 ) | Owens invention does more to eliminate child labor than previous legislative efforts
"Owens was an inventor. He was no designer, but he could direct engineers." Richard LaFra…
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