Some new tool comes along to share or transmit sound in a new way, and again and again its inventor has a hard time imagining how the tool will eventually be used. When Thomas Edison completed Scott’s original project and invented the phonograph in 1877, he imagined it would regularly be used as a means of sending audio letters through the postal system. Individuals would record their missives on the phonograph’s wax scrolls, and then pop them into the mail, to be played back days later. Bell, in inventing the telephone, made what was effectively a mirror-image miscalculation: He envisioned
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