{HEAD ~ One method} of measuring {TAIL ~ the resiliency} of a ball at impact is to utilize an air cannon or other means of propelling a ball at velocities equivalent to those of a golf club head 
of measuring
{ HEAD ~ One method } of measuring { TAIL ~ the resiliency } of a ball at impact is to utilize an air cannon or other means of propelling a ball at velocities equivalent to those of a golf club head
HEAD HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH