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Hi, Kathy.  I think Discovery Science Center in Santa Ana, CA, has  
the exhibit you describe.  There is another version of a tennis ball  
launcher at the California Science Center's Big Lab, available from  
Creative Machines in Tucson.

Chuck Howarth

Gyroscope has moved!  Please note our new address:
Gyroscope, Inc.
283 Fourth Street, Suite 201
Oakland, CA  94607
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510-986-0111On May 2, 2008, at 12:18 PM, Kathy Krafft wrote:

> Hi all--
>
> 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.  He'd like  
> to build one for our outdoor Science Park area.
>
> Our early experiments have not been very successful.  Any hints or  
> suggestions as to someone who has done this successfully would be  
> most appreciated!
>
> Kathy Krafft
> Exhibit Projects Director
> Sciencenter
> Ithaca, NY
> 607-272-0600 x25
>
>







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