DEVELOPMENT OF A COLORED TELETYPE TAPE DISCRIMINATION SYSTEM.
SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CALIF
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In some types of Navy teletype communications installations, messages in the form of paper tapes are fed into one tape reader for transmission if unclassified material, and into a separate tape reader for encoding and transmission if classified. The Bureau of Ships is investigating a system of color coding of paper tapes as a technique for safeguarding against unintentional transmission of classified information on the unclassified equipment. The Visibility Laboratory previously constructed a laboratory breadboard of a photoelectric apparatus capable of sensing the color of the paper tape and disabling the tape reader in the presence of tape of the wrong color AD-600 912. The present report describes the design and construction of an operational breadboard unit for mounting on the ANUGC-6 teletypewriter.