One method of measuring the resiliency of a ball at impact is to utilize {TAIL ~ an air cannon} or {HEAD ~ 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 impact is to utilize { TAIL ~ an air cannon } or { HEAD ~ 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 OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH