We have also used a similar vibration table system using five "scooter"
inner tubes under a granite slab. The five seperate small tubes gives
the table a little more stability. We have holes drilled in the table
top so that tube may be inflated from under the table.
                                        __    /
   Stephen H. Cody,                   _/  \__/ \
   Department of Physiology,         /          \
   University of Melbourne,         /  Australia \
   Parkville, Victoria 3052,        \   ____     /
   Australia.                        \_/    \_*_/
                                             __
                                             \/