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Walking to the train station, I found this waterwheel on display. According to someone I met at the Konstanz conference who researches these things,this paddle design works as follows: The water is comming down in a jet. The buckets are split down the middle, so the watter sloshes out the sides, essentially making for an elastic colision and so more energy transfer.  Salzburg  26 May 2004, 16:08
Dimensions	1704x2272 pixels
Exposure time	1/159 sec.
Exposure mode	Manual exposure
Flash	Flash did not fire, compulsory flash mode.
Shutter speed	234/32 sec. (APEX: 12)
Aperture value	f/5.6
Focal length	7.2 mm
Camera model	Canon Canon PowerShot G3