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