Event displays from the 81cm-bubble-chamber experiment

Keeping track on the tracks. The 81 cm hydrogen bubble chamber was fitted with a closed circuit television system so that experimenters could have a rough check, in the course of operation of the chamber, on the quality of the data they were storing on film. A burst of particles into the chamber, as transmitted by the camera, is shown in the photographs. The performance of the chamber and the beam-line feeding it could thus be roughly monitored 'on-line'.