Glossy 8.5 x 11 photo of a diagram for Engelbart's magnetic logic device patent issued in 1963, entitled "Magnetic Logic Device," signed in the lower left in black felt tip, "Doug Engelbart." In fine condition.
This patent represents Engelbart's early work on magnetic logic devices, which are inherently more stable than vacuum tubes and transistors, draw no power when unused, and are impervious to electromagnetic interference. Though this technology was soon surpassed by the advent of the integrated circuit and the silicon chip, the reliability and stability of magnetic core devices made them useful for applications in extreme environments, such as spaceflight.
From the collection of Bill Daul, a longtime friend and colleague of Douglas Engelbart.
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