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Old 08-29-2016, 04:47 PM
md2000 md2000 is offline
Join Date: Feb 2009
Posts: 13,550
Round iron hoops to bind staves, etc. - remember the round hoops could be heated, hammered onto the tapered barrel ends, and pushed down to where they forced the staves into a tight seal. The more acute the angle, the more likely you get a slip (broken corner) than a seal, so an n-go is more stable and solid than a square. For simpler construction, like the parts of a water wheel, you do see rectangular "buckets". If that leaks a bit during the 1 or 2 seconds it's holding water - who cares?