1876, a grand exposition was held in Philadelphia, USA, exhibiting the newly invented products in the world. One day, the king of Brazil visited. The king looked at a small box and receiver with great interest. Bell, a young inventor, ran over and asked the king to put the receiver to his ear while he was talking in the distance. When the king heard Bell's voice, he was surprised and said loudly, "Oh, my God, he spoke!" " Bell told the king that it was a telephone-a telephone. Since then, the telephone and Bell's name have spread all over the world.
How did Bell invent the telephone?
The idea of long-distance love has long existed. In the 1970s, American inventor Gray first designed a "couple telegraph device". He used two cans, and the bottom of each box was connected by a tight rope. When a person speaks to the jar at one end, the vibration is transmitted to the jar at the other end through the rope. This experiment made Gray realize that human voice is composed of tones with different frequencies. If you can design a suitable speaker, then turn the tone into an electrical signal, and then turn it into a voice at the other end, wouldn't it be possible to make a long-distance call?
Gray's idea is good, but it is not easy to realize. This arduous task fell to another inventor, Bell.
Bell was born in Scotland, England, 1869 settled in the United States and worked as a Chinese teacher at Boston University. Inspired by the telegraph device, he was determined to turn Gray's idea into reality.
Bell and his assistant Watson began to design a loudspeaker with a magnetic reed in the center. This loudspeaker can transmit sounds of various frequencies, and the vibrating reed is converted into various electric oscillations through electromagnetic induction. Devices with the same structure are placed at the other end of a certain distance and used as receivers. On February 1876, the invention obtained patent registration.
Soon, Bell Telephone Company was established. At that time, the telephone was surprisingly big, like a big box. The speaker had to shout loudly and could only speak in a small city.
The task of developing and perfecting telephone technology falls on the great inventor Edison. He innovated Bell's telephone structure and used carbon particle contact to control the current intensity. At the same time, Watson added magnetic bells and made switchboard equipment. At this time, the telephone gradually reached the point of perfection.
Starting from 1948, transistors gradually replaced communication devices such as relays. 1960, scientists invented the key dial, which used transistors to emit audio. In recent years, the laser telephone with laser as carrier source and the recording telephone instead of the host's answer have come out one after another, making the telephone an indispensable tool in modern life.
Gray, Bell, Watson, Edison, etc. As a pioneer of telephone invention, it has been recorded in history. The name of Bell Telephone Company is still famous all over the world.