A Study of Refill Phenomena in Williams' Tube Memories

A dot-circle scheme is proposed which will permit the distinction between binary ``O'' and ``1'' signals when the stored information has been destroyed approximately 90 per cent by refill. This unusual recovery of stored information is accomplished by making proper choices of operating parameters and using discharging effects instead of the charging effects as has been done in the past. Basic relationships are developed from Coulomb's law and the equivalent circuit of the Williams' memory to predict the binary out-put signals. The agreement between these theoretical signals and the actual experimental signals is remarkably good. A 5JP11 cathoderay tube was used in the experimental work.