| 单词 | Bell, Alexander Graham (1847–1922) |
| 释义 | Bell, Alexander Graham (1847–1922) The scientist and inventor of the telephone (1876), Bell was born and raised in Scotland and emigrated to Canada in 1870 and to the United States in 1871. Bell’s grandfather and father were teachers of elocution, and Bell followed his father as a teacher of the deaf, expanding his work through the study of acoustics. Bell’s work led to the development of various means of communicating with electricity. In addition to the telephone, Bell invented the photophone (1880), a system for transmitting voice utilizing mirrors to focus modulated sunlight onto a selenium cell. He was successful in transmitting voice over a distance of 700 feet on sunny days and was granted four patents for the invention. In 1881, Bell hurriedly invented the metal detector, which he used in an attempt to find an assassin’s bullet in the body of President James A. Garfield. Although the device worked, it was confused by the metal bed frame on which Garfield was lying and could not locate the bullet. Bell also held patents for the phonograph, hydrofoil watercraft, aerial vehicles, and selenium cells. See also bel, photophone, and telephone. |
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