Assembling the muon spectrometer branch of R702 at intersection I7, ISR

The experiment R702 by the CERN-Saclay CEN-ETH Zurich Collaboration was set up to search for charmed particles and elrctron pairs, with two magnetic spectrometers at 90 deg, threshold Cerenkov counters, drift and proportional chambers, hodoscopes and lead glass counters. Early in 1976 a special iron-plate muon magnet (shown in the photo) was fitted between the two electron spectrometers to extend the experiment to detect muon-electron coincidences. Ludwig Dumps stays on the right.