Edison's 1874 quadruplex telegraph, which sent two messages in each direction simultaneously on one wire, was a boon for Western Union. It was not simple to operate, though, as this cartoon indicated.
School of Arts and Sciences
Edison's 1874 quadruplex telegraph, which sent two messages in each direction simultaneously on one wire, was a boon for Western Union. It was not simple to operate, though, as this cartoon indicated.
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