The SS Great Britain
in Bristol Harbour. From Wikipedia "An advanced passenger steamship designed by Isambard Kingdom Brunel for transatlantic service between Bristol and New York. While other ships had previously been built of iron or equipped with a screw propeller, Great Britain was the first to combine these features in a large ocean-going ship. She was the first screw steamer to cross the Atlantic, which she did in 1845, in the then-record time of 14 days (one day faster than the previous record holder, the SS Great Western)."