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