Abstract: The invention relates to a process and an apparatus for compacting binary informations, then reconstructing and processing them in delayed time or with a time lag. It consists of compacting the binary informations by posting during a given cycle informations received on several channels and then associating non-zero information sums with memory channel numbers. It then consists solely of reconstructing the useful informations by coding them in cycle table form. Applied to nuclear fission, this invention consists of delayed time processing of tables in order to determine the proportion of neutrons induced by a fission and neutrons coming from other reactions.