Word: audion
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...control by tolls any radio inventions requiring the use of long-distance wires as connecting links, such as the multi-plex telephone and telegraph carrier systems. Also in 1917, before the radio fad had developed, it purchased from Lee DeForest, leading radio inventor, the patent rights of his audion vacuum tube, which is basic to all amplifying systems...
...older men, led some of the amateurs to embark in the business of making and selling wireless apparatus. The ordinary things were all homemade. In fact, it was impossible to buy some transmitting apparatus at all. Mr. Lee DeForest then brought out what he was pleased to term the "Audion" detector. It was a little incandescent lamp, with one or two fixings on it, and it was intended to take the place of the crystal of galena ore, or the bit of silicon. But it was found to be thousands of times more sensitive than the bit of galena...
...Physical Colloquium. "The Audion and its Uses in Radio Telegraphy." Jefferson Physical Laboratory, Room...