What did alexander bell invent? What contribution has he made to mankind?

Alexander? Bell, his original name is Alexander? Graham? Bell, who was born in Edinburgh, England, graduated from University College in London. He is a famous Scottish inventor and entrepreneur. His religion is Christianity. Today, Xiaobian will give you a brief talk about his achievements and contributions. I hope I can help you get to know him better. Alexander? Bell, he is a teacher of deaf-mute language, so he knows the feelings of those people very well, so he made a hearing aid and invented an instrument for measuring hearing, which can be used to find metal in the human body. In addition, Bell's main achievement was to invent the telephone, and he also patented the telephone invention and founded Bell Telephone Company. Besides inventing the telephone, Alexander? Graham? Bell also invented a giant kite carrying people and a hydrofoil for the Canadian navy to compete with Germany in World War II. In addition to these, he also improved the phonograph invented by Edison. In 1881, he designed a device to detect metal in order to find bullets in the president of the United States. Now this device is the predecessor of the X-ray machine we use now. Speaking of Alexander? Graham? Bell's contribution, he made a great contribution to the invention of deaf-mute language. He wrote more than 1 articles and pamphlets for this purpose, and for this reason, he also founded the British Association for the Promotion of Deaf-mute Education. The purpose is to help these deaf people. In 1883, Bell opened his own school for the deaf in Washington, but it didn't last long. In November 1885, the Washington School for the Deaf was forced to close due to the problem of teachers. Although it was closed, Bell's contribution to the deaf is remembered by all of us. His contribution to the deaf-mute did not disappear with the closure of the school, but was recorded in history forever. The above contents hope to help you understand Bell's achievements and contributions.