If you like this, you might also like Bill Hammack's series on a mechanical version of a fourier synthesizer (OK) and analyzer (wow!). Although it is multiple parts, each one is very short.
As a side note, the guy who designed it was Michelson, famous for the Michaelson/Morley experiment that disproved the existence of the luminiferous ether.
https://www.youtube.com/watch?v=NAsM30MAHLg
As a side note, the guy who designed it was Michelson, famous for the Michaelson/Morley experiment that disproved the existence of the luminiferous ether.