The S800 spectrograph is so tall that nuclei enter it at basement level, while the detector box stretches overhead at the normal floor level. In this photo, NSCL employees are installing a safety railing at basement level. The target chamber is just to their right, though hidden from view in the photo because it is underneath the intermediate-level deck. In general, many different kinds of nuclei will be scattered from the target. They are separated according to their energy by the two 75-ton superconducting dipole magnets curving up from the target chamber (the big "rust"-colored objects in the photo), which can be tuned so that only the nuclei of interest are directed into the big white detector box on the upper left. The spectrograph is mounted on a carriage so that it can be set to different angles (anything from zero to 60 degrees) around the target. Each deck has a circular turntable (on the left in the photo), and the outer end rolls on a steel rail on the floor, which cannot be seen in this photo, but which is concentric with the yellow circle on the basement floor.