Dear Dr. Helmholtz:
I tried the experiment with an empty 12 oz. bottle. Using my Korg tuner I
found that I was able to
alter the pitch from an f# down to an e, even an eb. The higher pitch came with the
completely open bottle
neck; to get the lower pitch I placed my finger across the far side of the opening
from where I was
blowing. The pitch change was certainly noticeable without using the meter for a more
precise analysis.
Howard--the room did not move much, but I got the distinct impression that the
lights were dimming!
Leonard Williams
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----- Original Message -----
Subject: Re: calling Dr. Helmholtz...
> BobClair wrote:
>
> > Try this at home and report back. Take a wine or beer bottle. Fill it 2/3 full
> > with water. (The change in pitch for a given change in area is bigger when the
> > volume is smaller - patially filling it with water makes the effect easier to
> > see (hear) but if you think this makes the results suspect leave the bottle
> > empty). Blow across the bottle, note the pitch. Now cover half the opening
> > with a
> > finger. Try it again (it may take a bit of practice to get the note). Did the
> > pitch go up or down?
>
