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[Robert Walton <waltonrp AT gmail.com>]

I googled, but nothing. what does it do? Pump water? Electricity?

Rob - Va

Here's a drawing of the key components of the Wirtz bike.  I may have left
> out a check valve or two.  The key to its success is the Wirtz alternator,
> which in this case is a double-chamber version that serves two hose coils,
> one on either side of the pedal asssembly.  Basically one coil receives
> water while the other receives compressed air, and then it flip-flops.
> http://home.earthlink.net/~clanl/wirtzbike.gif
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