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Portrait of Alexander Graham Bell
亞歷山大葛拉罕比爾是光影電話的發明人
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亞歷山大葛拉罕比爾 (Alexander Graham Bill) 在188063日發明了光影電話 (photophone)

你可能知道電話是用電來傳遞聲音通訊。但是,你可能不知道發明電話的人,也就是亞歷山大葛拉罕比爾 (1847-1922) 還有另外一項用光線來傳遞聲音的發明。他把這項發明稱為 光影電話。


You may know that a telephone uses electricity to send voice communications. However, you may not know that the man who invented the telephone, Alexander Graham Bell (1847-1922) had another invention that used light to transmit sound. He called it the photophone.

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