Phorosphore
The phorosphore is a process of analysis and mechanical restitution of an image for television imagined in 1889 by Lazare Weiller. It is presented in a communication to the Academy of Science and in an article “On the remote vision by electricity” published in Civil engineering (XV, October 12th, 1889, pp.570-573).
The apparatus, which will be indeed carried out only in 1898, was composed of a bearing drum on the side of tens of small polished metal plates forming mirrors, inclined according to variable angles so as to think on a photosensitive cell of selenium the various parts of the image. The reception, an identical apparatus, synchronized on the transmitter, made it possible to reconstitute the image. An image of 10 cm X 10 cm was cut out in 250.000 elements.
Five years after the definition of the disc of the German Paul Nipkow, Weiller presents an alternative method, more expensive but finer, described in Large encyclopedic Larousse under the name of “Wheel of Lazare Weiller”.
This process will be used in the first developments of mechanical television (1905 - 1932) and will be incorporated by John Logie Baird in the system implemented by BBC in 1932 for its first regular services.
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