Michelson's Harmonic Analyzer
Albert Michelson's Harmonic Analyzer is a nineteenth century mechanical calculator that can perform Fourier analysis of given functions. With only gears and other mechanisms, this computer is capable of producing a function given its Fourier coefficients (synthesis); and inversely, computing the Fourier coefficients of a sample function (analysis).
The device was designed in 1897 by the physicist Albert Michelson, and several models were manufactured and sold by William Gaertner & Co. One of the original machines was kept in the University of Illinois. In 2014, this machine was restored by Bill Hammack , renowning the artifact in some media.