It was also called a thermionic valve, vacuum diode, kenotron, thermionic tube, or Fleming valve.
2.
Relays and vacuum tubes ( thermionic tubes ) were commonly used as switching elements; a useful computer requires thousands or tens of thousands of switching devices.
3.
During his military service he worked under the wireless telegraphy pioneer Gustave-Auguste Ferri?at the Eiffel Tower radio station, and by 1914 he had produced his first patent, relating to thermionic tubes.
4.
Semiconductors, especially integrated circuits, are extremely susceptible to the effects of EMP due to the close proximity of the PN junctions, but this is not the case with thermionic tubes ( or valves ) which are relatively immune to EMP . A Faraday cage does not offer protection from the effects of EMP unless the mesh is designed to have holes no bigger than the smallest wavelength emitted from a nuclear explosion.
5.
Bush states that " technical difficulties of all sorts have been ignored, " but that, " also ignored are means as yet unknown which may come any day to accelerate technical progress as violently as did the advent of the thermionic tube . " Indeed, anyone who stops to consider the performance consequences of trail following let alone link-directed pointer chasing over a microfilm library of near universal scope should quickly come to the conclusion that microfilm is no more appropriate a technology for implementing AWMT's vision than Jules Verne's cannon is an appropriate technology for sending astronauts to the Moon.
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