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September, 1924
PICTURED LIFE FOR HOME, SCHOOL AND COMMUNITY
275
Photographs by Wire
A prominent engineer was recently talking to the Ambassador from Brazil over a long distance telephone line between Cleveland and New York. He said, "I hear your voice; — your words of greeting expressed a few minutes ago are before me in your own handwriting and I have just been handed your picture taken as you are talking to me. I almost feel as if I know you though we are hundreds of miles apart."
Another modern miracle, the transmission of photographs by "wired wireless" is an accomplished fact.
By H. E. Kranz, E. E.
electrode, instead of being controlled by the variation of voltage on the third electrode or grid as is the case in the radio vacuum tube. An enclosed lamp at C has its light focused at the point D on the cylinder. The cylinder is geared to a constant speed motor and not only revolves, but moves lengthwise at the rate of 1/65 inch per revolution. The spot of light will thus travel over the entire photographic print, the time required being 4j4 minutes.
The variation in the opaqueness of the print on which the spot of light falls causes a variation in the
The simplicity of the fundamental equipment used in sending and receiving these pictures is a remarkable feature. A positive photographic print on a 5x7 film is wrapped around a transparent cylinder (A) inside of which is a photoelectric cell (B) which differs from a radio vacuum tube in that the current in the plate circuit is controlled by the variation in the intensity of light falling on its third
plate current of the photoelectric cell.
In a dark room at the receiving station, an opaque cylinder (E), on which is wrapped a sensitized photographic film, is caused to move in the same manner and at the same speed as the cylinder at the sending station, the speed and the instant of starting being controlled by the sending station. An enclosed light at F is focused as a narrow band
of light on the film. The width of this band of light is controlled by an electro-magnetically operated shutter at G which is actuated by the plate current of the photoelectric cell in the sending cylinder, transmitted over telephone lines by a system which may be termed "wired wireless." Thus the film
Photograph of Pres. H. J. Ryan, American Institute of Electrical Engineers, transmitted over a telephone line from New York to Chicago.
when developed will give us a duplicate of the photograph used at the sending station.
A large number of photographs taken at the Republican and Democratic National Conventions were transmitted over telephone lines and printed in the metropolitan daily papers.
The wide application of this invention is significant. The daily press already uses it to transmit photographs and cartoons, the banks to transmit signatures, police departments to transmit finger prints, handwriting and photographs, and the moving picture producing companies will no doubt use it to transmit scenes from their California studios to their New York offices.