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