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