AMERICAN ITEMS.
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[It EUTEUS TkIECRAMS.] TRANSMISSION OF PHOTOGRAPHS THE METHOD EXPLAINED. (Received this day at 11.0 a.mA NEW YORK, .May 20.
A revolution in news photography is promised hy t lie new process of electrical transmission of pictures. The New York American Telephone and Telegraph Company sent fifteen photographs over a telephone wire in fwn hours from Cleveland, Ohio, to this city. The feat marks the culmination of eighteen years research h.v various scientists. It is declared the system will work hy wireless under favourable atmospheric conditions, hut not hy the Trans-Atlantic cable and is otherwise subject to limitations to distance. The apparatus consists of a cylinder around which is wrapped a positive transparent photographic film to which a negative from the desired picture has been transferred. Then, as the cylinder rotates, it moves along a spiral shaft exposing every portion of the picture to an intensely bright beam of light as though the latter were a needle on an old fashioned cylindrical graphophone record and the impressions of light and shade penetrate the film reaching the Nether photo electric cell, the current proceeding through a vacuum tube amplifier and modulator, ultimately to How through the telephone line. The engineers are confident fhe method will he of practical use at the Republican and Democratic Conventions since forty-five minutes represent the average time of transmission and development.
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Hokitika Guardian, 21 May 1924, Page 3
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229AMERICAN ITEMS. Hokitika Guardian, 21 May 1924, Page 3
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