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