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Date: | Fri, 2 May 2008 14:59:11 -0500 |
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Exploreum in Mobile has one. there is a hard rubber disk at the
bottom of the 'piston' tube, that both gives a seal to the
compression stroke when the bowling ball lands, and to slightly
cushion its fall. (another at the top - see below re: jerking the
rope). we replaced the disk after about 5 years of very hard use.
it was built by Hands-On...correct that, it was designed by Hands-on.
very very popular exhibit.
the connecting tube erich references, on ours, was the same size as
the tennis ball tube.
outdoors, you might have a serious issue with the plex degrading in
the sunlight. and you definitely want to keep an eye on the rope
attached to the bowling ball - it breaks and people will go boom on
the floor.
one interesting observation i can add; to get the tennis ball to go
higher, many, many of the visitors would jerk the rope as hard as
they could, as if the more force they exerted on raising the bowling
ball, the higher the tennis ball would shooot. Of course since
the force of compressed air was only a funciton of how far the ball
dropped, their extra effort did absolutely nothing. you'd think it
would be intuitive, but it wasn't.
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