On Fri, 10 Jun 2005 19:10:36 -0500, jerry wass wrote:

Thebaseball throwers use two motor driven wheels about the size of
wheelbarrow wheels the wheels run all the time, the ball rolls down
little ramp into the gap between the wheels and whoosh!! away it goes..

Fetch the stick Fido!

http://www.srl.org/machines/pitching/