Undersea cable: How William Thomson’s tiny mirror helped connect America and Europe by telegraph

William Thomson tackled the challenge of signal delays in extensive telegraph cables by creating a highly sensitive mirror galvanometer, capable of detecting faint electrical currents. Despite several expeditions being marred by obstacles and setbacks, the pivotal 1858 undertaking succeeded in bridging Europe and North America. Thomson's innovative instruments were crucial for the eventual triumph of this ambitious project.

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