The invention of the telephone:
The principle of early telephone is that sound is a compound vibration in the air, which can be transmitted to solids and to conductive metals through electric pulses. Alexander bell, an American, applied for a telephone patent in March 1876 and established Bell Telephone Company.
The earliest prototype of telephone appeared in18th century. At that time, Spanish scientists hoped that their information could be transmitted to far away places, so they built a machine to exchange information, which ended in failure because it was more troublesome to input information. Although this was a scientific failure, it laid a good foundation for countless improved experiments.
Just 30 years after this experiment, American inventor Morse invented the earliest telegraph, and in 1837, he also created a set of digital cipher "Morse cipher" which is still influencing today. This improvement summarizes the last experience and lessons, so that password input no longer needs multiple wires to guide transmission, but needs to learn passwords, so only high-level people used this kind of telegram at that time, and its popularity was not high.
The appearance of telegraph promoted the appearance of telephone. In 1960s, a German teacher in his twenties invented the first telephone, but he didn't patent it. On the contrary, Alexander Graham Bell, an American, first applied for a patent for the telephone, which led to the disagreement on the inventor of the telephone. Germany and the United States have their own opinions, and other telephone inventors have emerged.
However, at present, most people think that Bell is the inventor of the telephone. After all, he is the first person to apply for a patent. Bell not only made some achievements in the field of telephone, but also put forward the idea of manned space flight, made a huge kite for people to fly, and inspired the creation of paragliders in later generations. At the same time, he is a good friend of Helen Keller, a famous philanthropist and educator, and his personality charm is also the main reason why he is recognized by people.