🚀 go-pugleaf

In article <959@snap.mrcu>, paj@mrcu (Paul Johnson) writes:
> If you are ever in Paris, visit the Musee' Cite' (or something like
> that).  It is the Paris museum of science and technology.  One of the
> exhibits is this truly amazing 4 bit adder constructed of tubes and
> siphons with water feeding through them under gravity.  You punch in
> two 4 bit numbers on a control panel and hit the GO button.  Valves
> open and close at the top, the whole thing bubbles and gurgles for
> about 30 seconds, and tubes shaped as 1's and 0's fill up at the
> bottom with the Answer (not 42).

   That posting rang a bell!  But I don't remember where.  I've seen a
similar demo using (as I recall) tennis balls.  (Not quite pneumatic;
perhaps a bit closer to quantum mechanics.  ;-)   b.
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