What is this?

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http://forums.fedoraforum.org – Can anyone guess what this homebrew contraption is? All parts (knobs, dials, cabinet, inside parts) have been salvaged or made by me. Salvaged parts date back to the 20's and 30's. A hint: Although this apparatus looks like it requires some sort of power in order to work, well, in fact, it requires absolutely nothing to operate. It is both very low tech and very ecological. Attached Images Zext2.jpg (73.6 KB) (HowTos)