Part II

The first practical application of electricity was the telegraph, invented by Samuel F. B. Morse in 1837. The need for electrical engineers was not felt until some 40 years later, upon the invention of the telephone (1876) by Alexander Graham Bell and оf the incandescent lamp (1878) by Thomas A. Edison. These devices and Edison's first central generating plant in New York City (1882) created a large demand for men trained to work with electricity.

The discovery of the "Edison effect", a flow of current through the vacuum of one of his lamps, was the first observation of current in space. Hendrick Antoon Lorentz of the Netherlands predicted the electron theory of electrical charge in 1895, and in 1897 J. J. Thomson of England showed that the Edison effect current was indeed caused by negatively charged particles (electrons). This led to the work of Guglielmo Marconi of Italy, Lee De Forest of the United States, and many others, which laid the foundations of radio engineering. In 1930 the term "electronics" was introduced to embrace radio and the industrial applications of electron tubes. Since 1947, when the transistor was invented by John Bardeen, William H. Brattain, and William B. Shockey, electronics engineering has been dominated by the applications of such solid-state electronic devices as the transistor, the semiconductor diode, and the integrated circuit.

oriented - ориентированный

predication - предсказание

precede - предшествовать

primarily - преимущественно

emerge - происходить

radiation - излучение

wave - волна

existence - существование

application – применение, заявление

incandescent lamp – лампа накаливания

Date: 2015-07-02; view: 630; Нарушение авторских прав