first coil means for electromagnetically sensing relative proximity and left and right displacement of said projectile in terms of currents induced by {TAIL ~ the mechanical motion} of {HEAD ~ said projectile} 
first coil means for electromagnetically sensing relative proximity and left and right displacement of said projectile in terms of currents induced by { TAIL ~ the mechanical motion } of { HEAD ~ said projectile }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD