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 {HEAD ~ said sensor} 
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 { HEAD ~ said sensor }
OTH OTH OTH OTH 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 HEAD HEAD HEAD HEAD HEAD HEAD