Question

In 1857, French inventor Édouard-Léon Scott de Martinville patented the phonautograph, a device capable of transcribing sound waves into visual patterns on soot-coated paper or glass. Scott’s invention utilized a horn to focus sound onto a flexible diaphragm, which was attached to a stylus that traced the vibrations onto a rotating cylinder. Remarkably, Scott did not design the phonautograph to play back the recorded sound; rather, he believed that humans could learn to 'read' the resulting squiggles, much like stenographers read shorthand. For Scott, the visual representation of sound was an end in itself, a way to create a graphic archive of speech and music. It was not until 2008, when researchers at the Lawrence Berkeley National Laboratory used digital technology to scan and optically reconstruct the soot tracings, that Scott's 1860 recording of the French folk song 'Au Clair de la Lune' was finally heard. This achievement revealed that Scott had successfully captured the human voice nearly two decades before Thomas Edison invented the phonograph, which was designed from the outset for both recording and playback. While Edison remains the household name associated with audio technology, modern historians recognize Scott’s work not as a failed attempt at audio playback, but as a pioneering effort in the visualization of acoustic phenomena.

Based on the passage, which of the following best describes the author's primary purpose?