Re: resonance tube

[Brian Whatcott <betwys1@SBCGLOBAL.NET>]

At 08:24 AM 9/16/2003 +0200, you wrote:
> The setup: 1.5m transparent tube about 10 cm diameter///
> One notices that with the water just a centimetre or two below
> the  resonant position, the position apparently not affected by the
> frequency, the trace goes flat///
> Any suggestions as to what the mechanism may be?
>
> Mark
> Mark Sylvester
> UWCAd
> Duino Trieste Italy


Some more thoughts arising from suggestions in this thread:
-float a wood disk on the water surface to reduce
loss in surface waves.
-Reduce the exciter coupling by moving it further away, holding
the microphone to column distance constant
--Vary the microphone distance, while holding the loudspeaker
distance constant.
-Increase the speaker cone compliance by driving it through a
transistor collector (not via an emitter follower which has the
opposite effect)

Brian Whatcott    Altus OK    Eureka!