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alternating current America Fig amplifier anode antenna Baird broadcasting station camera tube carrier wave cathode cathode-ray tube Chapter coaxial cable color Columbia Broadcasting Company connected Corporation of America Courtesy Radio Corporation current flowing cycles a second direction elec electric current electric impulses electromagnetic waves electron beam electron gun electron image figure film scanner globule high frequency horizontal iconoscope inventors lens light beam light intensity light rays light values light-sensitive cell magnetic field mirror drum modulation motion-picture moving National Broadcasting Company negative Nipkow number of electrons object field operation perforation photoelectric cell picture elements picture signal picture tube plate circuit potential produced projected quency radio and television reflected rotating scanning device scanning disk scene screen sequence set of coils signal plate sound spot of light studio sweep synchronizing impulses tele television camera television picture television receiver television signal television system theater tion transmission transmitting vacuum tube vision wire