GREAT WALL OF CHINA History of the Great Wall of China: The Great Wall of China is the national military defense project in the cold weapon war era with the longest time and the largest amount of construction in the world. It condenses the sweat and wisdom of our ancestors and is the symbol and pride of the Chinese nation. According to historical records, since the Warring States period, more than 20 vassals and feudal dynasties have built the Great Wall. The earliest was the Chu Kingdom. To defend the nomadic or enemy countries in the north, they began to build the Great Wall. Subsequently, Qi, Yan, Wei, Zhao, Qin, and other countries also began to build their own Great Wall for the same purpose. After Qin unified the six countries, the famous emperor Qin Shihuang sent Meng Tian northward to the Xiongnu, connecting the Great Walls of various countries. From Linyao in the west to Liaodong in the east, it stretched for more than 10,...
WHO INVENTED TELEVISION?
When we look at too many, our parents scold us. Yet we cannot do without it. In reality, nobody can now do without TV!
Yet on January 26, 1926, 93 years ago, nobody thought that television would change our lives so much. Not even its inventor, the Scottish engineer John Logie Baird. But let's go in order.A FUTURISTIC IDEA
The story of the invention of television actually begins in the late 1800s, two centuries ago! Precisely on December 24, 1883, thanks to a special perforated disc invented by the German Paul Gottlieb Nipkow.
It was a simple disc full of holes arranged in a spiral that, rotating, analyzed the images: in practice the basic principle on which the TV is based. The system seen today makes you smile (it is very rudimentary), however, it was too futuristic for the technology of the time and was never built.
So 42 years passed. Until that is, the Scottish engineer John Logie Baird, on March 25, 1925, from the Selfridges shopping center in London publicly demonstrated the operation of his televisor. It was a success.
A few months later, on October 2, 1 925, the first television broadcast took place from Baird's laboratory to the room next door. The first image transmitted was the face of a bellhop from Baird 's laboratory, William Taynton. About three months later, on January 26, 1926, the Scottish scientist transmitted the face of his partner, Daisy Elizabeth Gandy, from room to room, in the presence of the press: TV was born.
IMPROVEMENTS
Another two years later the engineer broadcast a television signal not between two rooms but between two cities 700 km away, that is London and Glasgow, thanks to a common telephone line. In 1928, he made the first transoceanic transmission, from London to New York, and, always that year, he transmitted the first color images.
Baird's television was based on a mix of mechanical (Nipkow's disk) and electrical components. For this reason, it was called electromechanical television. But the development did not last long.
In fact, in 1939 this TV system was abandoned in favor of fully electronic television, which performed much better. This technology was demonstrated on September 7, 1927, by the American Philo Farnsworth in San Francisco.
Farnsworth also started from an idea that dated back to 1800, precisely from the cathode ray tube (do you remember the glass screen of old TVs? It is the cathode ray tube, which was invented by the German physicist Ferdinand Braun in 1897
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