{HEAD ~ A device} to compensate for {TAIL ~ distortion} in target location in a visual system 5 wherein said binary digital comparator means is adapted to compare target raster time with aiming point time, so that said one signal indicates that there is a coincidence between said first and said second signals 
to compensate for
{ HEAD ~ A device } to compensate for { TAIL ~ distortion } in target location in a visual system 5 wherein said binary digital comparator means is adapted to compare target raster time with aiming point time , so that said one signal indicates that there is a coincidence between said first and said second signals
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