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