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Though Alexander Graham Bell is best known for his telephone, he was proudest of his photophone, a device that uses rays of light to transmit sound. He made the first wireless call with it in 1880 and was so smitten with the invention that, to his wife’s dismay, he wanted to name his second daughter “Photophone.” Although outdoor interference from rain and clouds made the device impractical and it never caught on, it is considered the precursor to what modern method of information transfer? Discuss
Source: The Free Dictionary