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Specially developed diode valves are used as thermionic generators with an efficiency, at present, of only 20% but the heat taken away from the anode is used to raise steam for conventional power generation. It was Davy who first demonstrated that electricity could be used to produce light. He connected two carbon rods to a heavy duty storage battery.
The Marsoulas Cave has yielded one bevelled arrow shaft, made of reindeer antler, with a deep groove on the surface. A similar arrow-head was found in the Pacard Cave, and in other places arrows have been found with one or more grooves on the surface. Were these grooves or drills intended to hold poison, and was man already acquainted with this melancholy Diode of destruction?
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