English: The image shows a technical sketch of the upgraded CDHS detector at CERN, which was operational until 1984. The neutrino beam enters the detector from the left side, where it hits the Anti counter. The core of the detector consisted of 20 (19 before the upgrade) magnetized iron modules. In the spacings between these, drift chambers for track reconstruction were installed. Additionally, plastic scintillators were inserted into the iron. Each iron module served successively as an interaction target, where the neutrinos hit and produced hadron showers, a calorimeter that measured those hadrons' energy and a spectrometer, determining the momenta of produced muons via magnetic deflection.