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alternating current amplifier anode arrangement Baird beam of light carrier wave Cathode Cathode-ray Chemical Recorder circuit connected construction curve cylinder Diagram distance effect electric current electrodes exploring device exploring disc film focussed frequency gas-filled given in Fig glass glow discharge glow discharge lamp holes illumination inches infra-red rays intensity lens disc lenses light and shade light rays light sources light spot light waves light-sensitive cell lines means metal method mirror modulation neon lamp object or scene obtained oscillograph photo-electric cell photograph phototelegraphy picture Pinhole Camera plate potassium principle prism Radio receiving apparatus receiving end receiving station reproduced resistance revolving rubidium Selenium cell sensitive cell Shadowgraphs short wave shown in Fig slot source of light spiral spot of light Stereoscopic synchronism Telephone Televisor Televisor Receiver thallium trans transmission transmitting end traverse true television tube vacuum valve variations varying vision Vitreous Humour voltage volts wave-length wire wireless