Show kids ball used too even rubber balls are used to bring oil up from the depths of the earth they are shot down one 1 tube under pressure and come bouncing up another pushing a load of oil ahead of them while the balls are upward through the tubes they perform an additional function keep the pumping tubes clean by clearing out paraffin or anything else which might clog them natural gas is used to propel the balls and the gas la is recaptured at the end of the round it tr trip rip an and used over ever and over ever again |