Edison patents the phonograph 1878

Edison’s invention came about as spin-off from his ongoing work in telephony and telegraphy. In an effort to facilitate the repeated transmission of a single telegraph message, Edison devised a method for capturing a passage of Morse code as a sequence of indentations on a spool of paper. Reasoning that a similar feat could be accomplished for the telephone, Edison devised a system that transferred the vibrations of a diaphragm—i.e., sound—to an embossing point and then mechanically onto an impressionable medium—paraffin paper at first, and then a spinning, tin-foil wrapped cylinder as he refined his concept.