Noah Webster Dictionary (1913 edition): Telegraphoscope

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Noah Webster Dictionary (1913 edition): Telegraphoscope


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(n.) An instrument for telegraphically transmitting a picture and reproducing its image as a positive or negative. The transmitter includes a camera obscura and a row of minute selenium cells. The receiver includes an oscillograph, ralay, equilibrator, and an induction coil the sparks from which perforate a paper with tiny holes that form the image.