Radio

Guglielmo Marconi invented the radio,he was called the father of radio.,he is said to have read about the experiments that Hertz did in the 1880s.In that time Marconi began to understand that radio waves could be used for wireless communications.Marconi's early apparatus was a development of Hertz’s laboratory apparatus into a system designed for communications purposes. At first Marconi used a transmitter to ring a bell in a receiver in his attic laboratory. He then moved his experiments out-of-doors on the family estate near Bologna, Italy, to communicate further. Marconi transmitted radio signals for about a mile at the end of 1895.By 1895, Marconi introduced to the public a device in London, asserting it was his invention. Marconi’s late-1895 transmission of signals was for around a mile.Marconi's reputation is largely based on these accomplishments in radio communications and commercializing a practical system. His demonstrations of the use of radio for wireless communications, establishing the first transatlantic radio service, and building the first stations for the British short wave service, have hold a great place in history.

Aeroplane

The Wright Brothers, orville and Wilbur were the two American brothers who invented the world,s first sucessful airplane and making thefirst controlled,powered and sustained heavier-than-air human flight, on December 17,1903 at kitty Hawk, North California. It started When orville was 7 and Wilber was 11 years old.  His father Bishop Milton Wright gave them a toy aeroplane, which made them to dream of  inventing real plane. Their parents help them to go after their dreams. They wanted to know more about flight, as they collected and read every thing about it. The wright brothers also went in the printing bussiness,  printing a four page newspaper. Then they opened a bicycle shop in Dayton, ohio. In 1900 the wright brothers were ready to test their first glider. In December 17,1903 their dream become true, they flew four time, the first flight went about 120 feet, and the second and third flight went upto 175 feet each, then the fourth flight went upto 859 feet, which made them the way for sucess. The wright brothers were keep on studying and testing new designs. They began to teach others to fly. The brothers become very famous. They opened their own flying school as they become rich. Then sadly wilbur died of typhoid fever and orville died when he was 77. It was almost 100 years since that the first flight. We honour wright brothers for this great invention.

Typewriter

Typewriter was invented by Christopher Latham Sholes in 1867. Christopher Latham Sholes  was a U.S. mechanical engineer.He invented the typewriter with partners S.W. Soule and G. Glidden, that was manufactured (by Remington Arms Company) in 1873. Typewriter is a mechanical or electromechanical machine for writing in characters similar to those produced by printer's type by means of keyboard-operated types striking a ribbon to transfer ink or carbon impressions onto the paper. Typewriters were widely used by professional writers, in offices, and for business correspondence in private homes. The type writers are still commonly used in many parts of the world including India.

Mobile Phone

 Martin Cooper invented the cell (mobile) phone. He was the first one to make a call and speak on his moble phone.Mr Cooper, born December 26, 1928, wanted people to be able to carry their phones with them anywhere. While he was a project manager at Motorola in 1973, Cooper set up a base station in New York with the first working prototype of a cellular telephone, the Motorola Dyna-Tac. After some initial testing in Washington for the F.C.C., Mr. Cooper and Motorola took the phone technology to New York to show the public.
    Cell phone is a device that can make and receive telephone calls over a radio link while moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network.Mobile phones are used for a variety of purposes, including keeping in touch with family members, conducting business, and having access to a telephone in the event of an emergency. Some people carry more than one cell phone for different purposes, such as for business and personal use.Multiple SIM cards may also be used to take advantage of the benefits of different calling plans—a particular plan might provide cheaper local calls, long-distance calls, international calls, or roaming. The mobile phone has also been used in a variety of diverse contexts in society.
    The most commonly used data application on mobile phones is SMS text messaging. The first SMS text message was sent from a computer to a mobile phone in 1992 in the UK, while the first person-to-person SMS from phone to phone was sent in Finland in 1993.