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 {HEAD ~ the output} of 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 { HEAD ~ the output } of 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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH