How to connect current and sound waves to realize long-distance call?
Alexander bell is destined to accomplish this historic task. He systematically studied human voice, sound production mechanism and sound wave vibration principle. In the process of designing hearing AIDS for the deaf, he found that the spiral coil made noise at the moment when the current was cut off. This discovery suddenly occurred to Jambers-"Use the strength of current to simulate the change of sound size, so as to transmit sound with current."
From then on, Bell and his assistant Watson began the arduous process of designing telephones. 1On June 2, 875, Bell and Watson were working on the final design and improvement of the model. It's time for the final exam. Watson put his ear to the speaker in another room with closed doors and windows, ready to answer. Bell accidentally spilled sulfuric acid on his leg during the last operation. He cried out in pain, "Mr. Watson, come and help me!" " Unexpectedly, this sentence reached the ears of Mr. Watson, who works in another room, through the telephone in his experiment. This very common sentence, however, became the first voice transmitted by telephone and went down in history. 1June 2, 875 was also commemorated as a great day for the invention of the telephone, and this place, Court Road 109 in Boston, USA, also went down in history. Up to now, a bronze medal has been nailed to its door, which reads: "The telephone was born here on June 2nd, 1875." 1On March 7th, 876, Bell was granted a patent for telephone invention with the patent number: 174655.