At UA5

One of the two 6 m long streamer chambers for experiment UA5. The absorber plates used for neutrak particle conversion are visible. On the left and right sides of the frame can be seen the fiducial marks and the optical pattern used for adjusting the optics and checking the spatial esolution. The wires on top constitute a calibration grid for spatial reconstruction. See Annual Report 1979 p. 80, Fig. 12, and Annual Report 1980 p. 70, Fig. 6.