Vision by radio, radio photographs, radio photograms

Chapter 39: The Electrograph

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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 Electrograph

From the accompanying illustration and title it will readily be seen that rather good pictures were reproduced with pen and ink method in 1890.

The original of this picture was given the author by Mr. T. A. Witherspoon, who at the time of the experiment (1900) was a principal examiner in the U. S. Patent Office, and detailed in charge of the Patent Office Exhibit at the Buffalo Exposition, where, also, these machines were on exhibition.

It may be a coincidence of passing interest that from Cleveland twenty-four years later the American Telephone and Telegraph Company sent their first wire pictures.