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alternating current amplifier anode Aqueous Humour Baird beam of light Cambridge Instrument carrier wave Cathode Cathode-ray Cathode-ray tube Chemical Recorder connected construction curve cylinder D.C. motor device diagram distance drum effect electric current electrical resistance electrons film focussed form of Selenium frequency gas-filled glass Hartsdale illumination infra-red infra-red rays intensity inventors invisible rays Jenkins Korn's lamp Lens Disc lenses light rays light sources light waves light-sensitive cell lines magnetic means metal method mirror Noctovisor object or scene obtained optical oscillograph photo-electric cell photo-electric current photograph phototelegraphy picture plate potassium principle Prismatic Disc Radio rays of light receiving apparatus receiving end receiving screen receiving station reproduced resistance revolving rotating rubidium Selenium cell shadow cone Shadowgraphs short wave shown in Fig source of light spiral slot spot of light surface trans transmission transmitting end traverse true television tube valve variations varying vision Vitreous Humour wave-length wire wireless