From RetroThing and MatrixSynth: Dutch inventor Tatjana van Vark designed this mechanical computer designed to perform sine wave synthesis and Fourier Analysis. It has a mechanical sine generator that can draw a sine wave onto a paper drum based on the amplitude and phase. It also includes a mechanical integrator which you can use to trace the sine curve and perform a fourier analysis to extract the phase and amplitude of the curve, which is displayed on two dials.
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