Word: audion
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Dates: during 1920-1929
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...Audion Vacuum Tube Used...
...working with solutions it is necessary to use alternating current because direct current causes chemical action at the electrodes, which would cause gross errors in the measurement. Professor Jones uses as the source of the alternating current an audion vacuum tube hooked up with capacities and inductances so that it "howls", in the vernacular of the radio fan, although in this case it might better be described as "singing" because it gives a beautiful pure note of single frequency, and can be made to give any note desired within the range of audibility...
...talking movie is an invention of Dr. Lee de Forest, the inventor of the audion detector and other radio devices. He has dubbed it, to distinguish his invention from others of the same kind, the "Phonofilm...
...engineers of the military wireless service, General Gustave Ferie, M. Jouaust and Major Mesny, amplified waves from Capella, the blue star of the first magnitude in the constellation Auriga, into audible sound waves. The transformation was effected by a bulb of four electrodes, with much higher potential than the audion bulbs commonly used in wireless. The star is 71 light years (over 400 trillion miles) from the earth. The sounds were audible over a telephone to a considerable distance. The report was presented to the French Academy of Science...
...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...