When a second cable, under Thomson's supervision, was proposed, a new subsidiary company, the Telegraph Construction and Maintenance Company, was formed to execute the new venture.
William Thomson was appointed a director of the Atlantic Telegraph Company in 1856 and in 1858 was 'electrician' on HMS Agamemnon that laid the first transatlantic telegraph cable.
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Joining with Cyrus West Field and J. W. Brett, who controlled the Newfoundland Telegraph Company, Bright helped organize the Atlantic Telegraph Company in 1856 to develop a transatlantic cable, with himself as engineer-in-chief; Wildman Whitehouse soon joined them as chief electrician.