One Way Telegraph
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“A long ribbon of white paper is attached on a spool, and connected to a receiver that is wired to a switch. When the switch is closed, a signal is sent to the receiver, and it marks either a dot or dash on the paper.” -Avery 1895
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Telephone and Telegraph IndustrySource
Elroy M. Avery School Physics (New York: Sheldon and Company, 1895) 568
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