A diagram of Cowpers writing telegraph. Invented in 1878 by William Cowper (1819-1893), the machine was able to reproduce a message written some distance away by a process of interrupted electrical currents. This principle extended to recreating a hand-written message as a pencil transposed the movements of the current.

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TOP23728346

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達志影像

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RM

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須由TPG 完整授權

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