A sensor is held in a substantially fixed position relative to the insulation to measure {HEAD ~ force} exerted on the sensor by {TAIL ~ the insulation} 
exerted by
A sensor is held in a substantially fixed position relative to the insulation to measure { HEAD ~ force } exerted on the sensor by { TAIL ~ the insulation }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL