Two electrodes are attached to {TAIL ~ the crystal} with {HEAD ~ amplifier means} and a signal processing system connected to one of the electrodes to provide an ultrasonic receiver 
Two electrodes are attached to { TAIL ~ the crystal } with { HEAD ~ amplifier means } and a signal processing system connected to one of the electrodes to provide an ultrasonic receiver
OTH OTH OTH OTH OTH 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 OTH OTH