. It could transcribe sound to a visible medium, but had no means to play back the sound after it was recorded. The transcriptions, known as phonautograms, were first successfully played back in 2008, thanks to computer technology. The device consisted of a horn or barrel that focused sound waves onto a membrane to which a hog's bristle was attached, causing the bristle to move and enabling it to inscribe the sound onto a visual medium. Initially, the phonautograph made recordings onto a lamp-bl… (More on Phonautograph)