Permit me to introduce you to the facility of facsimile transmission. In facsimile a photocell is
caused to perform a raster scan over the subject copy. The variations of print density on the document cause the photocell to generate an analogous electrical video signal. This signal is used to modulate a carrier, which is transmitted to a remote destination over a radio or cable communications link. At the remote terminal, demodulation reconstructs the video
Dr. P.N. Cundall, Mining Surveys Ltd., Holroyd Road, Reading, Berks.
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