High-speed digital storage using cylindrical magnetic films

Digital stores consisting of closed magnetic circuits deposited on long glass tubes are described. These promise considerably increased operating speeds compared with present stores, together with the possibility of producing multi-element systems. A system designed to produce 30 tubes with 16 elements per tube in a single evaporation is now operating. Different selection modes which are more suitable for an array of this type have been tested, which permit greater tolerances than conventional selection systems.