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Hi Kathy,

I just saw something similar at the Franklin Institute.  I have a
vague recollection that the bowling ball pushed a disk below it to aid
in compressing the air however.

Good luck!

On Fri, May 2, 2008 at 3:18 PM, Kathy Krafft <[log in to unmask]> wrote:

>
>  Somewhere, long ago, one of our wonderful volunteers saw a neat exhibit
> where a small diameter pipe is connected near the bottom of a large diameter
> pipe.  A bowling ball drops down the large pipe, compressing the air inside
> it;  this causes the tennis ball resting on the smaller diameter tube to
> shoot way up in the air.
>
>  Our early experiments have not been very successful.  Any hints or
> suggestions as to someone who has done this successfully would be most
> appreciated!
>

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