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