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