The photophone (originally given an alternate name, radiophone) is a telecommunications device which allowed for the transmission of speech on a beam of light. It was invented jointly by Alexander Graham Bell and his assistant Charles Sumner Tainter on February 19, 1880, at Bell's laboratory at 1325 L Street in Washington, D.
例句与用法
1.
He called it the photophone 他把这项发明称为光影电话。
2.
Bell considered the photophone one of his most important inventions 贝尔认为光影电话是他最重要的发明之一。
3.
It took a long time before the idea behind bell ' s photophone became practical 贝尔花了很多时间，才把光影电话的概念付诸实践。
4.
Alexander graham bell develops the photophone which uses sunlight to carry messages . it was never commercially produced 亚历山大.格雷厄姆.贝尔利用太阳光开发光电话用于传输信息。这种光电话从未用于商业生产。
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