The ss Great Britain was the first steam powered, iron hull, ocean liner. She was designed by Isambard Kingdom Brunel and had her maiden voyage in July 1845. She is now on display where she was built in Bristol harbour. There is a lot of information online about her including this: ss Great Britain at Wikipedia.

Mooch waved to the schoolkids on the Matthew which often sails nearby.  (27-Sep-2011)