PIRA Classification: 1F20.10
Description: Two steel balls hang from a ring stand. Each ball has a loop of string hanging below them. A rod is inserted in the first loop and is jerked quickly. The rod is the inserted in the second loop and pushed down slowly, but firmly.
Special Instructions: Pulling down quickly should break the bottom string. Pushing slowly should break the top string.
Condition: OK
Setup time: 2 minutes
Safety Issues: Watch your fingers.