Description:A pencil is accelerated to almost the speed of sound by blasting it through a four-foot tube using a carbon dioxide fire extinguisher. The pencil will readily impale itself on a piece of 3/8" plywood. With a little bit of luck the pencil point will be virtually intact, although sometimes you need to re-sharpen it after the demonstration.
CAUTION: Be sure that the hose fitting is securely attached to the tube and that the plastic shield is in place before firing. T
Read 1352 times
Last modified on Tuesday, 12 January 2016 15:12