My Kind of Math! The Wooden Fourier Transform Machine

fourier analiser from Gymnasiumnovum on Vimeo.

Mixer math with plywood and gears.

http://www.instructables.com/id/Plywood-Math-Machine/

http://hackaday.com/2016/04/11/fourier-machine-mimics-michelson-original-in-plywood/#more-199177

http://hackaday.com/2014/11/18/harmonic-analyzer-mechanical-fourier-computer/