Table 2
Changes in the specification for ball compression
Year
Forward deformation (cm)
Return deformation (cm)
All values refer to type 2 balls.
1966
0.58–0.74
0.90–1.08
1972
0.56–0.74
0.89–1.08
1996
0.56–0.74
0.80–1.08
2000
0.495–0.597
0.749–0.965