Luciole, un appareil électronique utilisé pour le dépouillement et l'analyse des photographies de chambres à étincelles

' Luciole ', an apparatus to provide fully automatic scanning and analysis of spark-chamber photographs. The moving spot of light produced by the high-precision cathode-ray tube seen on the right is projected by a lens system through the stationary film on to the lightsensitive face of a photomultiplier. This produces an electrical signal which varies according to the pattern of sparks on the film, and in this way information on the location of each spark with respect to certain reference marks is fed directly to the computer. Working with the device here is Bent Stumpe.