Further, an annular alignment mark AM having a point of {HEAD ~ intersection} between the optical axis 01 and {TAIL ~ the image pickup element} of the television camera 3 as the center of symmetry and segments X and Y are displayed on the television monitor 5 by the output of the computer 
between
Further , an annular alignment mark AM having a point of { HEAD ~ intersection } between the optical axis 01 and { TAIL ~ the image pickup element } of the television camera 3 as the center of symmetry and segments X and Y are displayed on the television monitor 5 by the output of the computer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH