A telephone‚ or phone‚ is a telecommunications device that permits two or more users to conduct a conversation when they are not in the same vicinity of each other to be heard directly. A telephone converts sound‚ typically and most efficiently the human voice‚ into electronic signals suitable for transmission via cables or other transmission media over long distances‚ and replays such signals simultaneously in audible form to its user. The wordtelephone has been adapted into the vocabulary of many
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Inventions of the Renaissance Clocks The first mechanical clock was invented in the early 1300’s. With this invention time began to be measured in hours (24 hours equaling a day). Galileo‚ an Italian scientist‚ discovered the pendulum in 1581. The pendulum greatly improved the constant movement of the hands or bell of a clock. The average error with the pendulum varied only by seconds each day. Before this the error was from 10 to 15 minutes a day. During the 1600’s the metallic gear‚ or toothed
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The most important discovery in the last 100 years The most important discovery in the last 100 years A lot of significant discoveries have been made over the past centuries. While various discoveries in astronomy‚ science‚ physics set our lives on entirely different course‚ I strongly believe that the discovery of the fist antibiotic‚ penicillin played a crucial role in the history of mankind. Firstly‚ before the discovery of penicillin some diseases were incurable and any wound could result
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today ’s culture‚ electricity is a vital part of functioning as a society. Simple tasks‚ such as waking up at a designated time or enjoying a piece of music‚ are accomplished currently via electronic means. One only needs to consider the consequences of a relatively short power outage factories close down‚ phones and computers go dead‚ traffic slows to a crawl‚ food spoils in refrigerators to accurately observe how power-dependent our society has become. However‚ electricity is a constantly developing
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The Day that Changed my Life There I was having an ordinary day‚ a barbecue with my friends where all went as normal and then I get a call from my daughter‚ I was so happy as she hadn’t called me in over 6 weeks but that happiness was only temporary. She wanted to have lunch with me at that afternoon so I abandoned my friends and the barbecue just for her. While there our conversation stays on only one topic‚ me‚ until she wants the favour that I regret giving- my permission to go to Kenya for some
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The main purpose of the Declaration of Independence was to declare that the American colonies were separating from England (thus declaring independence). The document also stated what the principles were as the foundation for seeking independence. The document can be broken down into four parts.Introduction -States the purpose of the document; which was to explain why the American people were declaring independence from Great Britain. Theory - The theory of certain immutable rights possessed
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I would like to continue with some other Chinese inventions‚ then introduce a small research and draw our conclusions. Paper Money It is so common in out everyday life that we hardly give a thought to the fackt that it had to be invented by someone. Around 650 AD (po kr.)‚ the emperor of China began to issue paper "value tokens" for general use. The first paper banknotes appeared in China about 806 AD. Its original name was ’flying money’ because it was so light it could blow out of one’s
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using wires i.e.‚ transmitting power as microwaves from one place to another is in order to reduce the transmission and distribution losses. This concept is known as Microwave Power transmission (MPT). This paper is mainly concentrated on : i) The most popular concept known as Tesla Theory‚ ii) The microwave power transmission(MPT) called Solar power satellite‚ and iii) The highly efficient fiber lasers for wireless power transmission. The output microwave power ranges from 50 W to 200 W at 2.45
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The 1920’s brought new inventions‚ a new economy‚ a new culture‚ new threats‚ and new laws which all influenced the nickname of the Roaring Twenties. The invention of the assembly line by Henry Ford in 1913 began the automobile industry in America leading to a boom in the industrial industries. The moving assembly line became a standard for most American factories allowing mass production of products including cars‚ appliances‚ furniture‚ and clothing. With the inventions of the electric motor‚ washing
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There is one thing that happened in my life that changed it forever. This is the day my stepdad‚ Taylor‚ died. It started as a normal school day my freshman year. No one came to school because we were about to get off for a holiday‚ so everyone that showed up went to the auditorium to watch movies. A teacher came looking for me and said that I had to go to the office. I thought I was in trouble or something. When I walked in and saw my grandma and my aunt‚ I knew something was wrong. They
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