Why can't the Korean science and engineering community produce this kind of person?...............If you try to do a Chenhae homage to Yeonggal, you'll get hit with a stone.........lol. I've been doing the invention series of the Western Greatness series, and I'm the main character. For your information, the United States, Britain, France, Germany, Italy, and Japan are the representative countries with the highest standard of living, with negative reasons, of course ruthless imperialism... ...especially the United States, which is an indelible sin. But the positive reason is that they've produced a lot of these geniuses. Besides, the developed countries, except the United States, lost all their colonies after two world wars that killed themselves by the tens of millions, so the economic wealth they now enjoy seems well deserved. Of course, there is a socialist economic exploitation theory that the Third World was independent, but in Korea, if we plant Japanese parts and export them to the United States, we will benefit from it, right? It's a developed country. It has contributed to the development of technology. But the United States will continue to call... ...without dropping a bomb. Except for the airplane bomb. I don't think we should ignore the wailing of Indian resentment and the talent advantages that made them achieve such wealth. In March 1876, Alexander Graham Bell (1847-1922) invented the telephone and patented it, making it impossible to make calls between New York and Washington (about 330 km). Upon hearing this, Edison immediately examined the frame and found that the flaw lies in the fact that the same frame as the electronic receiver used today is used for songwriting, and struggled with the improvement. And, the carbon plate is inserted between the voice automatic plate and the fixed metal plate, and due to a very small pressure change caused by vibration of the voice vibration plate, a large change in electrical resistance of the carbon plate is devised. When speaking to the transmitter, the current from Volta's battery was changed by the change in resistance in the transmitter caused by voice, which was expanded to an induction coil to reach the receiver (1877). This method was much more distant than Bell's first method (which Bell himself later improved in many ways). Edison's approach was also changed by various outstanding improvements that followed shortly, but his use of carbon to take advantage of the change in resistance is of great value as opening up a new direction for the phone. The invention of the ● phonograph In the same year, Edison invented the phonograph. This was inspired by the study of carbon transmitters and the experiment of automatic telegraphs, in which Edison said: "No matter how small the ocean waves are, we are amazed at the exact sign of the curve that the ripples make as they go, on the sand on the coast. And we know that if you spray sand thinly on a glass plate or a smooth wooden board and put it on a piano, you'll see various straight lines and curves depending on the vibration of the sound. In these examples, it can be seen that the fine grains of the solid are also affected by weak waves of liquid or gas or sound. This phenomenon has been known for a long time, but it was only a few years ago that I came up with the fact that even the waves of human sound might give a material the same sign as the waves of the sea make a sign on a sandy beach." Edison was thinking of something like the Morse code for use as a repeater for the whole body, making traces on paper tape, and the traces going back into the transmitter and sending out Morse codes. So I thought the traces of this paper tape could reproduce the sound of Morse code. After much consideration, he invented a phonograph that attached tin foil to a cylinder, engraved with the vibration of sound as a flaw, and attached a needle to it to reproduce the sound. Once successful in this way, he actively struggled with the improvement. And from cylindrical records to original records, more than 100 patents were obtained for the invention improvement of the phonograph. At the time of the invention of the ● light, there was only an arc lamp that caused arc discharge between the two carbon rods, which had to be constantly changed because they burned out shortly, and although they were useful to some extent, they were too bright indoors and were harmful to the eyes. Since more than 30 years ago, when it was discovered that electricity generated heat and could be incandescent with high-melting wires, inventors have devised many ways to make indoor lights, which in fact have not succeeded in making useful incandescent lamps. And by that time, many researchers had already known that the use of carbon as a heating material for electric lights was a challenge, but not only was it difficult to process, but it was also difficult to keep it in a vacuum, or at least in a gas that contained no oxygen. And there were several researchers who tried to use a thin carbon rod for this purpose. In this state, Edison began the study in 1878. He first tried to make the heating material into a filament without using a thin carbon rod and then carbonize it. The first test was carbonized paper, which could not remove enough oxygen from the vacuum obtained by the vacuum pump that was being manufactured at the time, so the filament only glowed for about 10 minutes. So there was a time when metal filaments were invented. However, it was not possible, so he went back to carbon and carbonized cotton yarn instead of paper, but he failed countless times. Thus, on October 21, 1879, a single carbon filament could be made, and a light bulb that would continue to glow for more than 40 hours. Encouraged by this, he found out in 1880 that bamboo was the best material for better filaments, and set out to d to find the best bamboo. So, he spent $100,000 and sent people to China, Japan, the Malay Islands, India, Central America, and South America, which are known as bamboo producing areas, to collect various materials, and finally found that bamboo from Yawata near Kyoto, Japan was the best. For the next 10 years, the bamboo was used as a filament for incandescent light bulbs. In this way, the first practical carbon filament incandescent light bulb was made by his hand in 1880, which required a strong current to ignite. To do so, it was necessary to prepare all TM locations, sockets, fuses, etc. attached to the light bulb from the manufacture of efficient generators, design of distribution boards, design of integrated power meters, and cable construction. And Edison not only created these new things, but he also started a lighting company and tried to promote it, and eventually led it to the availability of anyone. This fact is a very great achievement. Needless to say, the manufacture of the above various electrical appliances was also a brilliant advance in electrical technology. Around this time (1883), he found that a metal plate inside the bulb was supported by a wire sealed through the wall of the glass sphere, and that when the filament was heated with direct current, a weak current flows between the plate and the anode. This is called the Edison effect. Edison did not go any deeper, nor did he try to put it into practical use, but in the 20th century, it was studied by many as a thermoelectric phenomenon, applied to radio and vacuum tubes, and developed into a more remarkable invention. ● Other inventions include the invention of cinematographers and projectors (1891), the invention of magnetic photometers (1891-1900), and the invention of Edison batteries (1900-1910). After World War I, he stopped working with the United States and became chairman of the United States Naval Advisory Committee, devoted himself to military science, but after the war, he returned to his laboratories and factories in West Orange to continue his vigorous work. This continued until his death (18 October 1931). Source: http://kin.naver.com/open100/entry.php?docid=25010 Inventions 1. Vote recorder (1868) 2. Stock listing indicator (1869) 3. Print telegraph (1871) 4. Dual telegraph (1872) 5. Electric typewriter (1873) 6. Copy plate (18757.4 duplexer (1874) 8. Carbon telephone (1877) 10. Back thermal electric lamp (1877) (18793) 1,8793DC generator (1879-1883) 19. Cinematographer (1891) 20. Projector (1891) 21. Magnetic photography_mining (1891-1900) 22. Meteor film (1913) 23. Edison storage battery (1900-1910) 24. Kinetophon (active photo+acoustic) 25. Rubber plant (1927) 26. Addison bridge 31
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