1On the afternoon of June 2, 873, Shell and its assistant Ma Sheng went to two rooms to jointly test their telegraph. Life glued a reed to the magnet for the telegram in the room on the ship. Life pulled the reed away. The shell found that the reed in the room on the ship rose by itself in the telegram and made a sound. This made the thoughtful scholar interested in discovery and made a new guess. He believes that the voice of human speech is a kind of air vibration. If you talk to a thin piece of iron, it will make the iron vibrate. If you put a magnetic field line behind an electromagnet, the vibration will change with the distance between the electromagnet and iron, which will change the electromagnet and the electromagnet coil will respond to the corresponding changing current. This current is transmitted to the electromagnetic coil of the other side along the wire, which will change the magnetic field lines of the electromagnetic core, drive its emergency shield, and thus produce sound. He told this view to life. Student, the electrical engineering teacher agreed with him very much, so he began to study and make it. 1875 finally made a "telephone" on June 3rd. A complete word of this kind of telephone means that it can be given away, but it cannot be given away. But they are already very happy with the first step of victory. Later, after repeated trials and improvements, they finally made a breakthrough. They filed a patent application with the US Patent Office on1February/August, 876 14. On March 7th, 1876 Patent Office granted the patent right of this kind of shell, thus confirming their invention. On1March 10, Besson and at tried their phones in two rooms respectively. For the first time, Besson heard the complete words from Besson: "Besson, please come here, I need you!" This is the first time that human beings have transmitted complete words by telephone.
The original invention of the telephone was simple. This kind of telephone can send information in one direction. Later, after many people's research and improvement, it was gradually improved.