The lateral position of the carriage, accordingly, provides {HEAD ~ a visual indication} of the tension in {TAIL ~ the test member} 
in
The lateral position of the carriage , accordingly , provides { HEAD ~ a visual indication } of the tension in { TAIL ~ the test member }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL