The greek distillation pot? It helps you to separate 2 liquids which are mixed, like water and alcohol for example. You heat up one of the pots which evaporates the mixture (turns it to steam), but then one of them will turn back into liquid on the journey from one pot to the other, so you end up with the separated liquids!
It is often use to extract essential oils to make perfumes or to make alcohol. I used a very old one when I went to a gin school (for adults of course).
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