Printed Cards for the Card Capacitor Memory [Letter to the Editor]

Foglia, McDermid and Petersen have described the card capacitor memory, a semipermanent, read-only storage device utilizing replaceable metallized IBM punched cards as the information storage medium.
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Although this device has a theoretically high signal-to-noise ratio, attempts to implement the scheme in a memory of useful size have been only partially successful because of the small coupling capacity available. This letter describes a revision of the original scheme which provides coupling capacity 10 to 30 times greater while maintaining a signal-to-noise ratio adequate for many purposes.