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This photograph shows P. Skarek (left), of CERN's MSC Division, and W. Hirt, of the Eidgenössische Technische Hochschule, Zurich, working on the apparatus used in the Propion experiment that was recently completed at CERN's 600-MeV synchro-cyclotron. The wheel in the background holds various target materials which can be switched into the beam as desired. In front of the wheel can be seen the television camera with whose aid the beam alignment is checked from the control room.