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aiff alternating current angular separation apparatus for television arc lamp at/f atom audience Bell Telephone Laboratories brilliancy caesium cell is exposed cells and tubes channel circle of light circuit corresponding cycles per second developed disc receiver distant scene elec electric cell electrical currents electrical energy electro-optical elements emitted equipment fifty-thousandths Figure 12 Figure 17 formed frequency glow grid grid''-receiver highly illuminated instant instantaneous intensity interfering currents lens light and shade light-active device light-sensitive element mechanical mirror molecules of air motion moving aperture negative neon tube number of electrons object occur operation pairs of electrodes particles persistence of vision phenomenon physiological eye picture planetary electrons portion potassium protons radio receiving station retina rotating row of fifty scanning beam scanning disc sending station shown in Figure sound waves sound-sensitive square successive areas synchronous motors system of television telephone transmitter telescope television system terminal tion twenty-five uncharged vacuum-tube variations voltage