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Transmitting sound without sound vibrations telephone experiment in the early 1900s New York. Sergius T. Grace, Vice President of Bell Telephone laboratories, holds wire and places paper to J. R. Ericson a lab technician who hears voice which passes through Graces body electrically.  Photo taken on April 9, 1992. (Photo by CQ Roll Call via Getty Images)

Transmitting sound without sound vibrations telephone experiment in the early 1900s New York. Sergius T. Grace, Vice President of Bell Telephone laboratories, holds wire and places paper to J. R. Ericson a lab technician who hears voice which passes through Graces body electrically. Photo taken on April 9, 1992. (Photo by CQ Roll Call via Getty Images)

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