The invention of the telephone is not the credit of anyone, but the result of the joint efforts of a large number of scholars. As early as 1876, many scientists have explained this communication method in theory. However, it is generally believed that the first telephone was put into use in the United States in 1876, and the invention right of the telephone should belong to Alexandria in the United States. Bell.
187 1 year, Bell returned to the United States from Scotland and became a professor at Boston University. Bell's father is a famous linguist and the inventor of sign language for the deaf. Bell's wife used to be his student, a deaf girl. Besides studying acoustics and teaching sign language, Bell really wants to invent a machine that can be heard by deaf people. Although this idea has never been realized, in June of 1875, Bell and his assistant Watson developed the world's first machine for transmitting sound-magnetoelectric telephone. However, the machine really started working on 1876, and in March 10. Bell was doing an experiment and accidentally spilled sulfuric acid on his feet. He couldn't help shouting into the microphone at Watson in the other room, "Watson, come and help me!" " "Unexpectedly, this cry for help became the first voice transmitted by telephone in the world, and Watson clearly heard Bell's voice from the receiver.
Bell invented the telephone, and Gray invented the liquid telephone with the same principle. Coincidentally, on the same day Bell filed a patent application, Gray also filed a patent application with the new york Patent Office and resold the patent invention right to the largest telecommunications company in the United States. As a result, a long-running lawsuit on the right to telephone invention has been going on for more than 10 years. Later, after detailed investigation, it was found that Bell applied for a patent in Bigret about two hours in advance. Accordingly, the court ruled that the telephone invention patent belonged to Alexander? Bell.
With the rapid development of electronic technology, not only the number of modern telephones has surged, but also the varieties and functions are not the same as before. In addition to the traditional manual telephone and automatic telephone, there are many special telephones, such as recording telephone and writing telephone, TV telephone that can be heard immediately, cordless telephone that is convenient to carry, and mobile phone that can be carried with you. In addition, there is a "oral mobile phone", and even a "deaf mobile phone" that can make deaf people talk has been successfully trial-produced.