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Memory and threshold switching processes are described, as observed in systems consisting of thin (∼0.5 μ) polymer films (polymethylmethacrylate, polystyrene, polyethylmethacrylate, polybutylmethacrylate) between inert electrodes (graphite, molybdenum, NESA glass). The memory off-state is highly linear, in contrast to the corresponding characteristics of multicomponent chalcogenide glasses. Switching speeds are probably similar or, at any rate, ≪10−7 sec.

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FROM recent x-ray diffraction data (2), it is possible to calculate a limiting density value for a few commercial carbon blacks. The values thus obtained are considerably higher than those generally accepted (4). The experimental values have, for the most part, been determined