As {HEAD ~ the shaft} deflects as the draft varies {TAIL ~ the magnet} will be shifted towards and away from the sensor causing a voltage variation in line  
As { HEAD ~ the shaft } deflects as the draft varies { TAIL ~ the magnet } will be shifted towards and away from the sensor causing a voltage variation in line
OTH HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH