Of course, angular displacement of {HEAD ~ the shaft} 20, relative to {TAIL ~ its null position}, is detected by the potentiometers 94 and 96 
Of course , angular displacement of { HEAD ~ the shaft } 20 , relative to { TAIL ~ its null position } , is detected by the potentiometers 94 and 96
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH