71cjssb83wo-pavan-trikutamThis invention surely rings bell.In 1870,two inventors Elisha Gray and Alexander Graham Bell both independently designed devices that could transmit speech electrically.Graham bell patented his telephone first.Elisha Gray and Graham Bell entered into a famous legal battle over the invention of telephone,which Bell won.Alexander Graham Bell success with the telephone came as a direct result of his attempts to improve telegraph. The classic story of him saying “Watson, come here! I want to see you!” is a well-known part of the history of the telephone.



Electricity is a energy which already exists in nature so it is not ‘invented’ but discovered.As to who discovered it, many misconceptions abound. Some give credit to Benjamin Franklin for discovering electricity, but his experiments only helped establish the connection between lightning and electricity, nothing more.The truth about the discovery of electricity is a bit more complex than a man flying his kite. It actually goes back more than two thousand years.In 1600 the English scientist William Gilbert,coined the modern Latin word ‘electricus’ from ‘elektron’,the Greek word for ‘amber’ which soon gave rise to the word-electricity.In 1752, Franklin conducted his famous kite experiment. In order to show that lightning was electricity, he flew a kite during a thunderstorm. He tied a metal key to the kite string to conduct the electricity.Just as he thought, electricity from the storm clouds transferred  to the kite and electricity flowed down the string and gave him a shock. He’s lucky that he didn’t get hurt, but he didn’t mind the shock since it proved his idea.



So many inventors participated in the development of television that it is impossible to give one credit for its invention.A few people,however can be recognized as pioneers in this field. Paul Nipkow proposed the first practical mechanical scanner in Germany in 1884.The scanner was a rotating disk with holes arranged in a spiral around its edge.Light passing through the holes,as the disk rotated produced a rectangular scanning pattern which could be used to either generate an electrical signal from the scene from transmitting or to produce an image from the signal at the receiver.John Logie Baird,a Scottish engineer successfully promoted a television system based on the Nipkrow principle.In 1927,an American,Philo Farnsworth,widely recognized as the inventor of electronic television was the first inventor of electronic television,was the first inventor to transmit a television image comprised of 60 horizontal lines.The image transmitted was a dollar sign.



The Wright brothers, Orville and Wilbur were two American brothers, inventors, and aviation pioneers who are generally credited with inventing, building, and flying the world’s first successful airplane.As part of Wright Brothers’ systematic practice of photographing every prototype and test of their various flying machines,they had persuaded an attendant from a nearby lifesaving station to snap Orville Wright in full flight.The craft soared to an altitude of 10 feet,traveled 120 feet and landed 12 seconds after takeoff.After making two longer flights that day,Orville Wright and Wilbur Wright sent this telegram to their father,instructing him to”inform press”. Wright brothers made their first successful powered flight in history on December 17,1903.At the time,very few realized its importance.The New York Times apologized 100 years later,for ignoring this historic event and not publishing it as a news item.


Computers have become a very important part of our daily life. This awesome machine changed our lives in so many ways.Charles Babbage following the mathematical ideas of George Boole,the mathematician who first stated the principles of logic inherent in today’s digital computer. After working on his revolutionary difference engine, designed to aid in navigational calculations, in 1833 he realized that a much more general design, an Analytical engine, was possible.The machine was about a century ahead of its time. All the parts for his machine had to be made by hand — this was a major problem for a device with thousands of parts. Eventually, the project was dissolved with the decision of the British Government to cease funding. Babbage’s failure to complete the analytical engine can be chiefly attributed to difficulties not only of politics and financing, but also to his desire to develop an increasingly sophisticated computer and to move ahead faster than anyone else could follow.Early digital computers were electromechanical; electric switches drove mechanical relays to perform the calculation. These devices had a low operating speed and were eventually superseded by much faster all-electric computers, originally using vacuum tubes. The Z2, created by German engineer Konrad Zuse in 1939, was one of the earliest examples of an electromechanical relay computer.The principle of the modern computer was proposed by Alan Turing in his seminal 1936 paper.




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