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@The NYC Toy fair 2008 Bridge Street Toys had their geek-famous hydrodynamic building sets - you can build a model of an ice cream factory, a water treatment plant, a distillation plant and many other industrial structures. It shows how a siphon works, balance the flow through the plant by adjusting the valves. The user learns the basic principles of fluid dynamics while constructing and playing with this learning kit.
The building set includes an electric pump, siphon tank, large square tank, small and large round and cone bottom tanks, float valve, tilt scale, ball flow meter, water wheel, spray head, and assorted valves, pipe holders and pipe. The pieces are interchangeable with all other Girder and Panel and Bridge and Turnpike Building Sets and are HO scale.
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This set is a lot of fun - I got to play with it when I was a kid about 20 or so years ago. The kicker is that set was originally my dad's, so it was already decades old at the time! I guess the classics never die.
http://users.rcn.com/ed.ma.ultranet/gphistory.html
http://users.rcn.com/ed.ma.ultranet/gpccnwl2.html
http://www.amazon.com/Girder-Panel-Tekton-Tower-Construction/dp/B000VOBC34
IIRC, the tubing you'll get will never be enough, so be sure to take a sample to the hardware store and buy a few extra feet. Then cut a variety of lengths so that junior can fine tune his/her design.
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That would make for a bad ass PC water cooling rig :D
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