ABSTRACT
how the pictures are built up—intensity modulation —variation of focus with intensity modulation— “soft” and “hard” tubes—shield focusing—the double gun cathode tube—division of voltage between guns—cathode-ray transmitter scanning— velocity modulation—” hesitating “light-spot— improvement of focus—automatic synchronisation —an all-electric scheme—a brightness difficulty—loss of detail—mixing intensity and velocity modulations—future of the velocity modulation system.
