Dr Ian Plummer
Technical
APPENDIX 2
BALL PERFORMANCE SPECIFICATIONS
- When dropped from a height of 60 inches onto a steel plate 1 inch thick set rigidly in firmly-based concrete, a ball must rebound to a height of not less than 30 inches and not more than 45 inches.
- The rebound heights of a set of balls to be used in a game must not differ by more than 3 inches.
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