Build this air driven motor with my son to demonstrate how steam engines work. I was explaining how the 90 degree phase offset between valve and piston determined the direction of rotation. He sat for a few seconds with a thoughtfull expression and then stated "oh so if I suck in stead of blowing it runs the other way?!" ... I didn't see that comming and yes it does :)
Air motor, a set on Flickr.
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