Mesmerizing rebuild of a mechanical Fourier calculator

Albert Michelson's harmonic analyzer -- a 19th century mechanical calculator that can do Fourier analysis with just gears, springs and levers -- was found at the University of Illinois, and then lovingly restored by a trio of makers who lavishly documented it in a book (free PDF/paperback/hardcover) and a mesmerizing video series.

Albert Michelson's Harmonic Analyzer: A Visual Tour of a Nineteenth Century Machine that Performs Fourier Analysis [Book]

Albert Michelson's Harmonic Analyzer [Youtube]

Albert Michelson's Harmonic Analyzer (book details) [Free PDF]

(via JWZ)