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