Fluid-based delay?

[WeAreAs1 at aol.com]

In a message dated 7/26/98 11:00:58 AM, you wrote:

<< -another similar interesting system i was told of was one where the tubes
in
question were filled with materials that conduct sound _more_ quickly than
air, so you actually get a negative delay (though not a whole lot).  never
heard whether it got built, though.  i think the idea was to use helium..
could be wrong.. 

Ethan  >>

No, helium is what you inhale to get that pitch-shifting effect.  Doesn't last
long, though.  If you want the precognitive delay effect, try inhaling nitrous
oxide.  Unfortunately, its effects, however thrilling, are also rather short-
lived.