Bob May wrote:
And you don't want to have good bearings in there or the bucket will tip as
if fills. Better to have a little restriction in the form of a wiper to
provide a stop til the bucket gets a bit further into the overfill. You don't
need much of an offset and if the bucket wants to go the wrong way, turn it
around. Might be fun to see a series of buckets that feed each other in a
triangle and figure out which one si going to be next. If you do a good
balancing at the beginning, it may last for a while.

-- Why isn't there an Ozone Hole at the NORTH Pole?


Wellington has a bucket fountain which has been something of a tourist
attraction for the last 40 years or so. It's a stack of bistable buckets, small
at the top graduating to large at the bottom. Every few years the sealed ball
bearings on the bucket pivots get replaced. I can't understand why they don't
use delrin bushes, it seems like an obvious application. Maybe that would be
tampering with a work of art?.