The Leviathan Steamship - View showing drum and bigchains, and position of ship before commencement of launch,
photographed by Robert Howlett and George Downer, ca 1857.

LeviathanConstructionHowlett and Downes, The Leviathan Steam Ship, ca 1857 (collection José Calvelo)

Wikipedia : https://en.wikipedia.org/wiki/SS_Great_Eastern