Vision by radio, radio photographs, radio photograms

Chapter 46: The Braun Tube Receiver

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About This Book

This work discusses the early innovations in transmitting images via radio, highlighting the patent by Nipkow in 1884, which proposed a system using a selenium cell and a rotating perforated disc to capture scenes. It also examines the contributions of Shelford Bidwell, who earlier described a method for telegraphic transmission of images. The text details the technological advancements in the field, including the use of polarizing light valves for image reception, and provides insight into the author's background as an inventor and pioneer in motion picture technology and radio photography.

The Braun Tube Receiver

One of the theoretically attractive forms of receivers is the Braun oscillograph tube, for it is so very easy to wobble the cathode ray spot about over the fluorescent screen, to form figures. It has an imponderable pencil of light which can be moved over the picture screen with very little electrical energy. Its use has been proposed by many.

But the feature of the system which is most often overlooked in this scheme is the necessity for an analytical picture machine at the sending station, and no such device in satisfactory workable form has yet been suggested.

The Braun tube system awaits, therefore, the attention of the practical-application engineer before it can compete with other forms of receivers.