I would guess it is part of an old laundry washer. The laundry would sit in a pot, probably copper, in the top and a fire stoked in the lower section to heat the water.
We had one similar, that sat in the back yard, back in the 50's.
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The way things are going with the economy you better hold on to that you may be using it soon. Always cool to find stuff like that. I found an old pot/cauldron had no idea what it was but my grandmother knew. She said was a cauldron of sorts but used to make soap from boiling animal fat. I still have it, reason I have it the thing weighs a ton and nobody want to mess with it.
Get your facts first, then distort them as you please-Mark Twain