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Old 08-29-2016, 07:55 PM
TruCelt TruCelt is offline
Join Date: Jan 2009
Location: Near Washington, DC
Posts: 9,905
They stayed round though, after plastic came along. I suspect this is because liquid sloshes less in a round bucket. Any straight side will make the liquid stop fast, and rush against itself, increasing the chance of it going over the edge. In a round one, the water tends to swirl, and so stay inside.