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Updated: May 2, 2025
The silk cord attached to the pencil regulates the current which controls another capillary glass tube-pen at the other end of the line. The receiving pen moves simultaneously with my stylus. It is the same principle as the pantagraph, cut in half as it were, one half here, the other half at the other end of the line, two telephone wires in this case connecting the halves. Ah, that's it.
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