sensor means for providing an output which varies as a function of said parameter, located distal to said bend on said first segment; and {HEAD ~ means} for measuring {TAIL ~ the output} of said sensor 
sensor means for providing an output which varies as a function of said parameter , located distal to said bend on said first segment ; and { HEAD ~ means } for measuring { TAIL ~ the output } of said sensor
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH