A centrifuge is a device that spins at high speed in order to separate products into parts based on density. Here's one. The good news: A centrifuge can help turn a hunk of watermelon into a seedless lozenge of super-concentrated flavor. A tomato soup can be rich, intense, and yet perfectly clear. The bad news: Centrifuges vary dramatically in power, so much that a fairly pricey model might not actually be able to perform the miraculous feats of chef-goddery you envy. Centrifuges with fatigued rotors can also fall apart, sometimes in spectacularly dangerous fashion. But hey, they're on eBay.
If an air popper or cast iron skillet feels too modern (this isn't for centrifuge types), go with this 1890s hand-crank-powered popcorn popper. You have to do it while hunkered over an open fire. Judging by the size of the thing, you'd better not be serving a crowd. Soup it up a bit though, and it'd be the perfect steampunk contraption for producing snacks to accompany screenings of The Adventures Of Baron Munchausen.
3. Gravy Separator:
This 1950s utensil (made in Japan, the buyer surmises) is designed to rid gravy of fat via a small drain. The phrases "Heavy Gravy" and "Lean Gravy" are inexplicably emblazoned on the bowl part, which is a good enough reason to buy it. You'd probably use your gravy separator twice a year, but wouldn't it look nice hanging from a hook in the kitchen?