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Updated: May 15, 2025
Vail, in the practice of the first line, grew accustomed to sending messages by dipping the end of the wire in the mercury cup, the beginning of the present transmitting instrument, which is also his invention and Morse's "port-rule," types, and other complicated arrangements, went into the scrap-heap. Yet there were some strange things still left. The receiving relay weighed 185 pounds.
To decipher the message, a special code-book or dictionary would be required. In order to transmit the currents through the line, he devised a mechanical sender, in which the circuit would be interrupted by a series of types carried on a port-rule or composing-stick, which travelled at a uniform speed.
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