One method of measuring {HEAD ~ the resiliency} of {TAIL ~ 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 
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One method of measuring { HEAD ~ the resiliency } of { TAIL ~ 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
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD 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