The positions of {HEAD ~ the tracers} is determined by {TAIL ~ differential transformers} having cores fixed for radial movement with respective tracers 
The positions of { HEAD ~ the tracers } is determined by { TAIL ~ differential transformers } having cores fixed for radial movement with respective tracers
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH