This large memory card is the plated-wire memory used in Univac 9000 series computers and the Univac 1110 in the late 1960's and early 1970's. Iron-Nickel coated wires store the magnetic field vs. ferrite cores used core memory. Plated-wire memory was easier and cheaper to produce and it also has a non-destructive read. This particular plane measures about 8 x 18.5 inches and has arrays on each side. Each side is covered with a fiber shield.