Computer 36 may also automatically activate {HEAD ~ the conventional alarm} 32 to alert {TAIL ~ the drilling operator} to the occurrence of a kick 
to alert
Computer 36 may also automatically activate { HEAD ~ the conventional alarm } 32 to alert { TAIL ~ the drilling operator } to the occurrence of a kick
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH